Origin

from Greek puon

pyo-

Word Origin

a combining form meaning “pus,” used in the formation of compound words:

pyogenesis.

Also, especially before a vowel, py-.

Origin

< Greek, combining form of pýon; akin to Latin pūs pus

Related Words

pyogenesis
pyogenic
pyonephritis
pyorrhea
pyothorax
pyoureter

pyo-a word element meaning 'pus'.

[Greek, combining form of pyon]

pyo-
combining form
⇨ see py-

pyo-|paɪəʊ|before a vowel py-, repr. Gr. πυο-, combining form of πύον pus; used to form medical and pathological terms. pyoˈcoccal a. [Gr. κόκκος grain], pertaining to the ‖ pyoˈcoccus, a microbe or coccus causing suppuration. ‖ pyoˈcœlia [Gr. κοιλία cavity], the presence of pus in the abdominal cavity (Dunglison 1853). pyˈoctanin(e [Gr. κτείνειν to kill], name given to methyl violet from its alleged power of checking suppuration. pyoˈcyanine (also -in) [cyanin], a blue colouring matter, 5-methyl-9-oxo-5, 9-dihydrophenazine, C₁₃H₁₀N₂O, obtained from blue or lead-coloured pus; so pyocyˈanic a. ˈpyocyst, an encysted collection of pus, esp. in the lung. pyoˈderma, pyodermia; pyoˈdermic a. [dermic], of or pertaining to ‖ pyoˈdermia, a purulent state of the skin. ‖ pyodiˈathesis, a purulent diathesis. ‖ pyœˈdema [œdema], œdema caused by purulent infiltration (Dunglison 1853). pyoˈgenesis, the formation of pus, suppuration; so pyogeˈnetic, pyoˈgenic adjs., of or pertaining to pyogenesis; producing pus. † pyoˈhæmia, = pyæmia (Dunglison 1842); hence † pyoˈhæmic a. = pyæmic (Syd. Soc. Lex. 1897). pyohæmoˈthorax, presence of pus and blood in the pleural cavities. ˈpyolymph, lymph containing pus corpuscles. ‖ pyometra |-ˈmiːtrə| [Gr. µήτρα womb]: see quot. pyoneˈphritis [nephritis], suppurative inflammation of the kidney; hence pyoneˈphritic a. ‖ pyoneˈphrosis [Gr. νεϕρός kidney: see -osis], the presence of pus in the kidney; hence pyoneˈphrotic a. ‖ pyoperiˈcardium, the presence or a collection of pus in the pericardium. ‖ pyophˈthalmia, production of pus in the eye (Dunglison 1853). ‖ pyopneumoperiˈcardium [pneumopericardium], the presence of pus together with air or gas in the pericardium. ‖ pyopneumoˈthorax [pneumothorax], the presence of pus and air in the pleural cavities; = pneumopyothorax. ‖ pyˈoptysis [Gr. πτύσις spitting], expectoration of pus (Dunglison 1842). ‖ pyoˈrrhœa [Gr. ῥοία flux], (also, U.S., -rrhea) discharge of pus; also, spec. (in full pyorrhœa alveolaris) a purulent inflammation of the tissues surrounding the teeth that results in shrinkage of the gums and loosening of the teeth. ‖ pyoˈsalpinx [Gr. σάλπιγξ a tube], the presence of pus in the Fallopian tube. ‖ pyoseptiˈcæmia, pyæmia together with septicæmia; hence pyoseptiˈcæmic a. ‖ pyoˈthorax [thorax], collection of pus in the pleural cavities. pyoˈxanthin, pyoˈxanthose [Gr. ξανθός yellow], a yellow colouring matter found with pyocyanin in blue suppuration.1896Allbutt's Syst. Med. I. 726 Potent also against the *pyococcal infections.1897Ibid. III. 715 Due to the *pyococci contained in the sputum they swallow.1890Lancet 11 Oct. 783/2 [He] has tried *pyoktanin, the new aniline antiseptic, in several cases of suppurative ear disease.1891Standard 2 Feb. 5/2 Experiments with solutions of methyl violet, also called pyoctanine, a new pigment manufactured at Darmstadt.1901W. Osler Princ. & Pract. Med. (ed. 4) 163 The *pyocyanic disease..is an extremely interesting form of infection with bacillus pyocyaneus.1860Chem. News II. 119/1 M. Fordos has..succeeded in extracting..blue matter to which he gives the name of *pyocyanine.1866–8Watts Dict. Chem. IV. 752 Pyocyanin crystallises in needles or in rectangular flakes.1873C. H. Ralfe Phys. Chem. 40 A blue colour is often noticed on the dry bandages and linen which have been in contact with pus; this is due to pyo-cyanin.1947Sci. News V. 90 Many bacteria in presence of certain organic substances, which they activate, reduce a molecule such as pyocyanine to its colourless leuco form.1949H. W. Florey et al. Antibiotics I. xii. 549 Pyocyanine, a substance which is now recognized to be bactericidal and to which pyocyanase probably owes some of its activity... This is the blue pigment to which ‘blue pus’, characteristic of infection by Ps[eudomonas] pyocyanea, owes its name.1957G. A. Swan in Swan & Felton Phenazines x. 176 Pyocyanine, the first phenazine compound discovered in nature.1976Ann. Rev. Microbiol. XXX. 247 The purified enzyme contains FAD, which functions when pyocyanine is the electron donor.[1853Dunglison Med. Lex., *Pyocystis, vomica.]1858Mayne Expos. Lex., Pyocystis, term for a cyst of pus, especially in the lung; a vomica: a pyocyst.1930Arch. Dermatol. & Syphilol. XXI. 151 The case was presented simply as *pyoderma.1930Ibid. XXII. 655 The term ‘pyoderma’ denotes a purulent infection of the skin due to pyogenic organisms, ordinarily staphylococci.1936Ibid. XXXIII. 811 Pyodermas and ulcerations of the skin have been described under various names.1974Passmore & Robson Compan. Med. Stud. III. xix. 102/2 A rare skin lesion which is almost specific for ulcerative colitis and Crohn's disease is pyoderma gangrenosum; intra-epidermal bulla form and contain clear fluid which soon becomes milky and frankly purulent, but is sterile.1899Allbutt's Syst. Med. VIII. 911 Certain other clinical forms of *pyodermia have received special names.Ibid. 918 Impetiginous and other *pyodermic disorders.1858Mayne Expos. Lex., *Pyodiathesis.1847Todd's Cycl. Anat. IV. 116 The true doctrine of *Pyogenesis is a modification of that of ‘secretion’.1896Allbutt's Syst. Med. I. 55 note, Pyogenesis must not be confounded with inflammation.1858Mayne Expos. Lex., Pyogeneticus,..*pyogenetic.1896Allbutt's Syst. Med. I. 70 The pyogenetic inflammation.1897Ibid. II. 86 Pyogenetic bacteria are as a rule present in varying numbers.1839–47Todd's Cycl. Anat. III. 754/2 note, The *pyogenic membrane..lines the cavity of an abscess.1861N. Syd. Soc. Year-bk. Med. 137 On the Pyogenic or Suppurative Diathesis.1896Allbutt's Syst. Med. I. 73 Conditions of great virulence of the pyogenic microbes.1890Cent. Dict., *Pyohemothorax; *Pyolymph.1893W. R. Gowers Dis. Nerv. Syst. (ed. 2) II. 333 If a scalpel is passed over the surface, it removes a little pyo-lymph.1860Tanner Pregnancy iii. 181 The collection..of pus—*pyometra—in the [uterus].1876J. S. Bristowe The. & Pract. Med. (1878) 831 The cholesterine was traced to a *pyonephritic cyst.1897Allbutt's Syst. Med. IV. 308 Abscess of the kidney, with or without perinephritic abscess, and pyelitis, leading to *pyonephrosis.1885W. Roberts Urin. & Renal Dis. iii. v. (ed. 4) 514 Contracted from the pressure of a *pyonephrotic tumour.1853Dunglison, *Pyopericardia, a collection of pus in the pericardium.1898Allbutt's Syst. Med. V. 125 Successful cases of draining the pyo-pericardium have been published.Ibid. 776 Pyopericardium is occasionally acute in its manifestations.1878tr. Von Ziemssen's Cycl. Med. VIII. 124 *Pyopneumopericardium has thus far been observed only a few times.1898Allbutt's Syst. Med. V. 214 In a few recorded cases a pulmonary cavity has perforated the pericardium and produced pyopneumopericardium.1894Lancet 3 Nov. 1033 The right side of the chest gave the physical signs of a *pyopneumothorax.1897Allbutt's Syst. Med. III. 537 Pyopneumothorax or gangrene of the lung.1811Hooper Dict., *Pyorrhœa, a purulent discharge from the belly.1875Dental Cosmos XVII. 278 Your correspondent..while not very definite in his descriptions, is sufficiently so to indicate the disease as ‘pyorrhoea alveolaris’ of the French writers.1878tr. von Ziemssen's Cycl. Med. VIII. 777 The treatment of chronic pyorrhœa.1921Daily Colonist (Victoria, B.C.) 25 Mar. 7/6 (Advt.), Be suspicious of any tenderness or bleeding of the gums. This is usually the first stage of Pyorrhea—an insidious disease of the gums that destroys the teeth.1975J. Symons Three Pipe Problem xii. 93 The brick and mortar shaking loose like teeth with pyorrhoea.1878tr. von Ziemssen's Cycl. Med. X. 345 The accumulation of pus in the tube—*pyosalpinx—may even lead to ulceration of the mucous membrane.1897Allbutt's Syst. Med. IV. 132 Other symptoms significant of a general *pyosepticæmic infection of the system are present.1853Markham Skoda's Auscult. 319 Effusions of blood, or pus—Hæmothorax—*Pyothorax—into the pleural cavity.1876tr. von Ziemssen's Cycl. Med. IV. 611 Purulent pleuritis (pyothorax, empyema).1873C. H. Ralfe Phys. Chem. 40 Minute yellow crystals of *pyoxanthin.1866–8Watts Dict. Chem. IV. 752 After the separation of the pyocyanin, the chloroform retains in solution a yellow substance called *pyoxanthose.

pyo-

word-forming element meaning "pus," from comb. form of Greek puon "pus" (see pus).

pyo- /ˈpʌɪəʊ/ combining form of Greek puon pus, used esp. in Medicine: see -o-. Before a vowel py-.

DERIVATIVE pyarˈthrosis noun, pl. -throses /-ˈθrəʊsi:z/, an infected joint filled with pus; suppurative arthritis: M19.
pyoˈcoccal adjective of or pertaining to a pyococcus L19.
pyoˈcoccus noun, pl. -cci /-k(s)ʌɪ, -k(s)i:/, any of various cocci causing suppuration, esp. Streptococcus pyogenes L19.
pyoˈcyanase noun a preparation, formerly used as an antibiotic, obtained from the bacterium Pseudomonas aeruginosa E20.
pyoˈcyanine, -in noun a toxic blue pigment, C₁₃H₁₀N₂O, produced by the bacterium Pseudomonas aeruginosa and responsible for colouring pus blue or green M19.
pyoˈderma noun any pyogenic infection of the skin M20.
pyoˈdermia noun = pyoderma L19.
pyoˈdermic adjective of or pertaining to pyoderma L19.
pyoˈgenesis noun the formation of pus, suppuration M19.
pyogeˈnetic, pyoˈgenic adjectives of or pertaining to pyogenesis; producing pus: M19.
pyoneˈphrosis noun the presence of pus in the kidney following obstruction and infection L19.
pyopneumoˈthorax noun the presence of pus and air in the pleural cavity L19.
pyoˈrrhoea, *-rrhea noun orig., discharge of pus; now (in full pyorrhoea alveolaris), periodontitis: E19.

pyo-

combining form. pus: Pyogenesis = the formation of pus. Also, py- before vowels.

[< Greek pýon pus]

pyo-
— see py-

pyo-

Prefix

medicine of or relating to pus

Etymology

From the Ancient Greek πύον (púon, “pus”), from Proto-Indo-European *pu-; compare Sanskrit पूयति (pūyati, “stinks, rots”), Ancient Greek πύθω (pýtho, “to rot”), Gothic 𐍆𐌿𐌻𐍃 (fuls, “foul”), Old English fuls (“foul”), perhaps ultimately echoic of a natural exclamation of disgust or abhorrence.

Derived terms

English words prefixed with pyo-

pyocyanin

pyomelanin

pyorubin

pyoverdine

词汇	pyo-
词根词缀	AHD Collins Dictionary.com Macquarie MWCD OED Online Etymology Dictionary SOED WBD Webster Wiktionary pyo- 或 py- pref.（前缀） Pus: 脓，脓液： pyoderma. 脓皮病语源 Greek puo- 希腊语 puo- from puon [pus] * see pü- 源自 puon [脓液] 参见 pü- pyo- or (before a vowel) py- combining form denoting pus ⇒ pyosis Origin from Greek puon* pyo- Word Origin 1 a combining form meaning “pus,” used in the formation of compound words: pyogenesis. Also, especially before a vowel, py-. Origin < Greek, combining form of pýon; akin to Latin pūs pus Related Words pyogenesis pyogenic pyonephritis pyorrhea pyothorax pyoureter pyo-a word element meaning 'pus'. [Greek, combining form of pyon] pyo- combining form ⇨ see py- pyo-\|paɪəʊ\|before a vowel py-, repr. Gr. πυο-, combining form of πύον pus; used to form medical and pathological terms. pyoˈcoccal a. [Gr. κόκκος grain], pertaining to the ‖ pyoˈcoccus, a microbe or coccus causing suppuration. ‖ pyoˈcœlia [Gr. κοιλία cavity], the presence of pus in the abdominal cavity (Dunglison 1853). pyˈoctanin(e [Gr. κτείνειν to kill], name given to methyl violet from its alleged power of checking suppuration. pyoˈcyanine (also -in) [cyanin], a blue colouring matter, 5-methyl-9-oxo-5, 9-dihydrophenazine, C₁₃H₁₀N₂O, obtained from blue or lead-coloured pus; so pyocyˈanic a. ˈpyocyst, an encysted collection of pus, esp. in the lung. pyoˈderma, pyodermia; pyoˈdermic a. [dermic], of or pertaining to ‖ pyoˈdermia, a purulent state of the skin. ‖ pyodiˈathesis, a purulent diathesis. ‖ pyœˈdema [œdema], œdema caused by purulent infiltration (Dunglison 1853). pyoˈgenesis, the formation of pus, suppuration; so pyogeˈnetic, pyoˈgenic adjs., of or pertaining to pyogenesis; producing pus. † pyoˈhæmia, = pyæmia (Dunglison 1842); hence † pyoˈhæmic a. = pyæmic (Syd. Soc. Lex. 1897). pyohæmoˈthorax, presence of pus and blood in the pleural cavities. ˈpyolymph, lymph containing pus corpuscles. ‖ pyometra \|-ˈmiːtrə\| [Gr. µήτρα womb]: see quot. pyoneˈphritis [nephritis], suppurative inflammation of the kidney; hence pyoneˈphritic a. ‖ pyoneˈphrosis [Gr. νεϕρός kidney: see -osis], the presence of pus in the kidney; hence pyoneˈphrotic a. ‖ pyoperiˈcardium, the presence or a collection of pus in the pericardium. ‖ pyophˈthalmia, production of pus in the eye (Dunglison 1853). ‖ pyopneumoperiˈcardium [pneumopericardium], the presence of pus together with air or gas in the pericardium. ‖ pyopneumoˈthorax [pneumothorax], the presence of pus and air in the pleural cavities; = pneumopyothorax. ‖ pyˈoptysis [Gr. πτύσις spitting], expectoration of pus (Dunglison 1842). ‖ pyoˈrrhœa [Gr. ῥοία flux], (also, U.S., -rrhea) discharge of pus; also, spec. (in full *pyorrhœa alveolaris) a purulent inflammation of the tissues surrounding the teeth that results in shrinkage of the gums and loosening of the teeth. ‖ pyoˈsalpinx* [Gr. σάλπιγξ a tube], the presence of pus in the Fallopian tube. ‖ pyoseptiˈcæmia, pyæmia together with septicæmia; hence pyoseptiˈcæmic a. ‖ pyoˈthorax [thorax], collection of pus in the pleural cavities. pyoˈxanthin, pyoˈxanthose [Gr. ξανθός yellow], a yellow colouring matter found with pyocyanin in blue suppuration.1896Allbutt's Syst. Med. I. 726 Potent also against the pyococcal infections.1897Ibid. III. 715 Due to the pyococci contained in the sputum they swallow.1890Lancet 11 Oct. 783/2 [He] has tried pyoktanin, the new aniline antiseptic, in several cases of suppurative ear disease.1891Standard 2 Feb. 5/2 Experiments with solutions of methyl violet, also called pyoctanine, a new pigment manufactured at Darmstadt.1901W. Osler Princ. & Pract. Med.* (ed. 4) 163 The pyocyanic disease..is an extremely interesting form of infection with bacillus pyocyaneus.1860Chem. News II. 119/1 M. Fordos has..succeeded in extracting..blue matter to which he gives the name of pyocyanine.1866–8Watts Dict. Chem. IV. 752 Pyocyanin crystallises in needles or in rectangular flakes.1873C. H. Ralfe Phys. Chem. 40 A blue colour is often noticed on the dry bandages and linen which have been in contact with pus; this is due to pyo-cyanin.1947Sci. News V. 90 Many bacteria in presence of certain organic substances, which they activate, reduce a molecule such as pyocyanine to its colourless leuco form.1949H. W. Florey et al. Antibiotics I. xii. 549 Pyocyanine, a substance which is now recognized to be bactericidal and to which pyocyanase probably owes some of its activity... This is the blue pigment to which ‘blue pus’, characteristic of infection by Ps[eudomonas] pyocyanea, owes its name.1957G. A. Swan in Swan & Felton Phenazines x. 176 Pyocyanine, the first phenazine compound discovered in nature.1976Ann. Rev. Microbiol. XXX. 247 The purified enzyme contains FAD, which functions when pyocyanine is the electron donor.[1853Dunglison Med. Lex., Pyocystis, vomica.]1858Mayne Expos. Lex., Pyocystis, term for a cyst of pus, especially in the lung; a vomica: a pyocyst.1930Arch. Dermatol. & Syphilol. XXI. 151 The case was presented simply as pyoderma.1930Ibid. XXII. 655 The term ‘pyoderma’ denotes a purulent infection of the skin due to pyogenic organisms, ordinarily staphylococci.1936Ibid. XXXIII. 811 Pyodermas and ulcerations of the skin have been described under various names.1974Passmore & Robson Compan. Med. Stud. III. xix. 102/2 A rare skin lesion which is almost specific for ulcerative colitis and Crohn's disease is pyoderma gangrenosum; intra-epidermal bulla form and contain clear fluid which soon becomes milky and frankly purulent, but is sterile.1899Allbutt's Syst. Med. VIII. 911 Certain other clinical forms of pyodermia have received special names.Ibid. 918 Impetiginous and other pyodermic disorders.1858Mayne Expos. Lex., Pyodiathesis.1847Todd's Cycl. Anat. IV. 116 The true doctrine of Pyogenesis is a modification of that of ‘secretion’.1896Allbutt's Syst. Med. I. 55 note, Pyogenesis must not be confounded with inflammation.1858Mayne Expos. Lex., Pyogeneticus,..pyogenetic.1896Allbutt's Syst. Med. I. 70 The pyogenetic inflammation.1897Ibid. II. 86 Pyogenetic bacteria are as a rule present in varying numbers.1839–47Todd's Cycl. Anat. III. 754/2 note, The pyogenic membrane..lines the cavity of an abscess.1861N. Syd. Soc. Year-bk. Med. 137 On the Pyogenic or Suppurative Diathesis.1896Allbutt's Syst. Med. I. 73 Conditions of great virulence of the pyogenic microbes.1890Cent. Dict., Pyohemothorax; Pyolymph.1893W. R. Gowers Dis. Nerv. Syst. (ed. 2) II. 333 If a scalpel is passed over the surface, it removes a little pyo-lymph.1860Tanner Pregnancy iii. 181 The collection..of pus—pyometra—in the [uterus].1876J. S. Bristowe The. & Pract. Med.* (1878) 831 The cholesterine was traced to a pyonephritic cyst.1897Allbutt's Syst. Med. IV. 308 Abscess of the kidney, with or without perinephritic abscess, and pyelitis, leading to pyonephrosis.1885W. Roberts Urin. & Renal Dis. iii. v. (ed. 4) 514 Contracted from the pressure of a pyonephrotic tumour.1853Dunglison, Pyopericardia, a collection of pus in the pericardium.1898Allbutt's Syst. Med. V. 125 Successful cases of draining the pyo-pericardium have been published.Ibid. 776 Pyopericardium is occasionally acute in its manifestations.1878tr. Von Ziemssen's Cycl. Med. VIII. 124 Pyopneumopericardium has thus far been observed only a few times.1898Allbutt's Syst. Med. V. 214 In a few recorded cases a pulmonary cavity has perforated the pericardium and produced pyopneumopericardium.1894Lancet 3 Nov. 1033 The right side of the chest gave the physical signs of a pyopneumothorax.1897Allbutt's Syst. Med. III. 537 Pyopneumothorax or gangrene of the lung.1811Hooper Dict., Pyorrhœa, a purulent discharge from the belly.1875Dental Cosmos XVII. 278 Your correspondent..while not very definite in his descriptions, is sufficiently so to indicate the disease as ‘pyorrhoea alveolaris’ of the French writers.1878tr. von Ziemssen's Cycl. Med.* VIII. 777 The treatment of chronic pyorrhœa.1921Daily Colonist (Victoria, B.C.) 25 Mar. 7/6 (Advt.), Be suspicious of any tenderness or bleeding of the gums. This is usually the first stage of Pyorrhea—an insidious disease of the gums that destroys the teeth.1975J. Symons Three Pipe Problem xii. 93 The brick and mortar shaking loose like teeth with pyorrhoea.1878tr. von Ziemssen's Cycl. Med. X. 345 The accumulation of pus in the tube—pyosalpinx—may even lead to ulceration of the mucous membrane.1897Allbutt's Syst. Med. IV. 132 Other symptoms significant of a general pyosepticæmic infection of the system are present.1853Markham Skoda's Auscult. 319 Effusions of blood, or pus—Hæmothorax—Pyothorax—into the pleural cavity.1876tr. von Ziemssen's Cycl. Med.* IV. 611 Purulent pleuritis (pyothorax, empyema).1873C. H. Ralfe Phys. Chem. 40 Minute yellow crystals of pyoxanthin.1866–8Watts Dict. Chem.* IV. 752 After the separation of the pyocyanin, the chloroform retains in solution a yellow substance called pyoxanthose. pyo- word-forming element meaning "pus," from comb. form of Greek puon "pus" (see pus). pyo- /ˈpʌɪəʊ/ combining form of Greek puon pus, used esp. in Medicine: see -o-. Before a vowel py-. DERIVATIVE pyarˈthrosis noun, pl. -throses /-ˈθrəʊsi:z/, an infected joint filled with pus; suppurative arthritis: M19. pyoˈcoccal adjective of or pertaining to a pyococcus L19. pyoˈcoccus noun, pl. -cci /-k(s)ʌɪ, -k(s)i:/, any of various cocci causing suppuration, esp. Streptococcus pyogenes L19. pyoˈcyanase noun a preparation, formerly used as an antibiotic, obtained from the bacterium Pseudomonas aeruginosa E20. pyoˈcyanine, -in noun a toxic blue pigment, C₁₃H₁₀N₂O, produced by the bacterium Pseudomonas aeruginosa and responsible for colouring pus blue or green M19. pyoˈderma noun any pyogenic infection of the skin M20. pyoˈdermia noun = pyoderma L19. pyoˈdermic adjective of or pertaining to pyoderma L19. pyoˈgenesis noun the formation of pus, suppuration M19. pyogeˈnetic, pyoˈgenic adjectives of or pertaining to pyogenesis; producing pus: M19. pyoneˈphrosis noun the presence of pus in the kidney following obstruction and infection L19. pyopneumoˈthorax noun the presence of pus and air in the pleural cavity L19. pyoˈrrhoea, -rrhea noun orig., discharge of pus; now (in full pyorrhoea alveolaris), periodontitis: E19. pyo- combining form. pus: Pyogenesis = the formation of pus. Also, py- before vowels. [< Greek pýon pus] pyo- — see py- pyo- Prefix medicine of or relating to pus Etymology From the Ancient Greek πύον (púon, “pus”), from Proto-Indo-European pu-; compare Sanskrit पूयति* (pūyati, “stinks, rots”), Ancient Greek πύθω (pýtho, “to rot”), Gothic 𐍆𐌿𐌻𐍃 (fuls, “foul”), Old English fuls (“foul”), perhaps ultimately echoic of a natural exclamation of disgust or abhorrence. Derived terms ► English words prefixed with pyo- pyocyanin pyomelanin pyorubin pyoverdine
随便看	psychotropic psych-, psycho-, -psyche, -psychic, -psychical, -psychically psychro- psychrometer psychrophobia psychro-, psychr- psylli-, psyll- pt- ptarmic ptarmigan ptarmo-, ptarm- pter- -pter pter -ptera -pteran pterid- pterido- pterido-, pterid- -pteris ptero- pterodactyl ptero-, pter-, -ptera, -pteron, -pteryx, -ptery, -pterous -pterous -pterus