Origin

from Greek aktino-, from aktis beam, ray

actino-

Word Origin

a combining form with the meaning “ray, beam,” used in the formation of compound words, with the particular senses “radiation” in the physical sciences (actinometer) and “having raylike structures,” “radiate in form” in biology (actinomyces; actinopod).

Also, especially before a vowel, actin-.

Origin

< Greek, combining form representing aktī́s (genitive aktînos) ray, beam; see -o-

Related Words

actinopterygian
actinobacillus
actinochemistry
actinodermatitis
actinodrome
actinogram

actino-1. Chemistry a word element used in compounds relating to actinism or actinic activity, as in actinotherapy.

2. Zoology a word element used in compounds relating to radiate structures, as in actinoid.

Also, actin-. [Greek aktīno-, combining form of aktis ray]

actino-
combining form
⇨ see actin-

actino-a. Gr. ἀκτῑνο- combining form of ἀκτίς (gen. ἀκτῖν-ος) a ray, a beam, as in ἀκτῑνοβόλος darting rays. Entering into numerous derivatives, chiefly connected (1) with actinism, (2) with animals related to the Actinia. actinodermatitis, dermatitis arising from the action of actinic rays; actinomorphic a. = actinomorphous a.1906Dorland Med. Dict. (ed. 4) 27/1 Actinodermatitis..X-ray dermatitis.1898H. C. Porter tr. Strasburger's Textbk. Bot. i. i. 16 Such parts of plants as may be divided by each of three or more longitudinal planes into like halves are termed either..Radial, or Actinomorphic.

actino-

before vowels actin-, word-forming element meaning "pertaining to rays," from Greek aktis (genitive aktinos) "ray, radiance;" perhaps cognate with Sanskrit aktuh "light, ray," Gothic uhtwo "dawn, daybreak," Lithuanian anksti "early."

actino- /ˈaktɪnəʊ, akˈtɪnəʊ/ combining form of Greek aktin-, aktis ray: see -o-.

DERIVATIVE ˌactinoˈmorphic adjective (Botany) (of a flower) characterized by radial symmetry (opp. zygomorphic) L19.
ˌactinoˈmycin noun an antibiotic obtained from actinomycetes M20.
ˌactinomyˈcosis noun a disease of animals (esp. cattle), and sometimes of people, caused by infection with actinomycetes and most commonly affecting the mouth, jaw, or neck L19.
ˌactinomyˈcotic adjective pertaining to or suffering from actinomycosis E20.
ˌactinopteˈrygian adjective & noun [Greek pterugion fin, dim. of pterux wing] (designating or pertaining to) a ray-finned fish, a fish belonging to the subclass Actinopterygii, which includes most living bony fishes L19.
ˌactinoˈtherapy noun treatment of disease by means of ultraviolet radiation E20.
ˌactino-uˈranium noun the uranium isotope of mass 235 E20.

actino-
— see actin-

actino-
actin-

Prefix

biology Used to form the terms relating to organisms etc. that have a radial form
physics Used to describe terms related to actinic radiation

Etymology

From Ancient Greek ἀκτίς (aktís, “ray”).

Derived terms

English words prefixed with actino-

词汇	actino-
词根词缀	AHD Collins Dictionary.com Macquarie MWCD OED Online Etymology Dictionary SOED Webster Wiktionary actino- 或 actin- pref.（前缀） Radial in form: 呈放射状的： actinoid. 放射线状的 Actinic radiation: 光化学辐射线： actinometer. 光化线强度计语源 From Greek aktis aktin- [ray] 源自希腊语 aktis aktin- [光线] actino- or (before a vowel) actin- combining form indicating a radial structure ⇒ actinomorphic indicating radioactivity or radiation ⇒ actinometer Origin from Greek aktino-, from aktis beam, ray actino- Word Origin 1 a combining form with the meaning “ray, beam,” used in the formation of compound words, with the particular senses “radiation” in the physical sciences (actinometer) and “having raylike structures,” “radiate in form” in biology (actinomyces; actinopod). Also, especially before a vowel, actin-. Origin < Greek, combining form representing aktī́s (genitive aktînos) ray, beam; see -o- Related Words actinopterygian actinobacillus actinochemistry actinodermatitis actinodrome actinogram actino-1. Chemistry a word element used in compounds relating to actinism or actinic activity, as in actinotherapy. 2. Zoology a word element used in compounds relating to radiate structures, as in actinoid. Also, actin-. [Greek aktīno-, combining form of aktis ray] actino- combining form ⇨ see actin- actino-a. Gr. ἀκτῑνο- combining form of ἀκτίς (gen. ἀκτῖν-ος) a ray, a beam, as in ἀκτῑνοβόλος darting rays. Entering into numerous derivatives, chiefly connected (1) with actinism, (2) with animals related to the Actinia. actinodermatitis, dermatitis arising from the action of actinic rays; actinomorphic a. = actinomorphous a.1906Dorland Med. Dict. (ed. 4) 27/1 Actinodermatitis..X-ray dermatitis.1898H. C. Porter tr. Strasburger's Textbk. Bot. i. i. 16 Such parts of plants as may be divided by each of three or more longitudinal planes into like halves are termed either..Radial, or Actinomorphic. actino- before vowels actin-, word-forming element meaning "pertaining to rays," from Greek aktis (genitive aktinos) "ray, radiance;" perhaps cognate with Sanskrit aktuh "light, ray," Gothic uhtwo "dawn, daybreak," Lithuanian anksti "early." actino- /ˈaktɪnəʊ, akˈtɪnəʊ/ combining form of Greek aktin-, aktis ray: see -o-. DERIVATIVE ˌactinoˈmorphic adjective (Botany) (of a flower) characterized by radial symmetry (opp. zygomorphic) L19. ˌactinoˈmycin noun an antibiotic obtained from actinomycetes M20. ˌactinomyˈcosis noun a disease of animals (esp. cattle), and sometimes of people, caused by infection with actinomycetes and most commonly affecting the mouth, jaw, or neck L19. ˌactinomyˈcotic adjective pertaining to or suffering from actinomycosis E20. ˌactinopteˈrygian adjective & noun [Greek pterugion fin, dim. of pterux wing] (designating or pertaining to) a ray-finned fish, a fish belonging to the subclass Actinopterygii, which includes most living bony fishes L19. ˌactinoˈtherapy noun treatment of disease by means of ultraviolet radiation E20. ˌactino-uˈranium noun the uranium isotope of mass 235 E20. actino- — see actin- actino- actin- Prefix biology Used to form the terms relating to organisms etc. that have a radial form physics Used to describe terms related to actinic radiation Etymology From Ancient Greek ἀκτίς (aktís, “ray”). Derived terms ► English words prefixed with actino-
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combining form

Origin

actino-

Related Words

actino-actin-

Prefix

Etymology

Derived terms

actino-
actin-