octa-
combining form
a variant of octo-
octo- or octa- or (before a vowel) oct-
combining form
eight
⇒
octosyllabic
⇒
octagon
Origin
from Latin octo, Greek oktoocta-
Word Origin
1
a combining form occurring in loanwords from Greek and Latin, where it meant “eight” (octagon; octastyle), on this model, used in the formation of compound words, and in chemical terms specialized to mean “having eight atoms” (octavalent).
Also, oct-, octo-.
Origin
< Greek okta-, combining form of oktṓ eight
Related Words
- cyclooctatetraene
- oct-
- octachord
- octadecanoic acid
- octagon
- octahedron
octa-a word element meaning 'eight'.
Also, oct-, octo-. [Greek, combining form of okto]
octa-
combining form
or octo- also oct-
octane
octoroon
combining form
or octo- also oct-
ETYMOLOGY Greek okta-, oktō-, okt- (from oktō) & Latin octo-, oct-, from octo — more at eight
: eightoctane
octoroon
octa-
（元音前亦作oct-）
combining form
- eight; having eight表示“八”, “有八个”：
-
octahedron.
词源
from Greek oktō 'eight'.
1900 H. W. Smyth Greek Metric Poets 195We might arrange (the passage) in Octapodies.
1877 Octachloride . [ see octad 3]
1914 Jrnl. Chem. Soc. CV. 2233The acetates of the dextrorotatory carbinols from ethylbutylcarbinol (γ-heptanol) on to ethylpentadecylcarbinol (γ-octadecanol) are all of negative rotation.
1949 E. Chain in H. W. Florey et al. Antibiotics II. xvii. 709Antifoam reagent (3 per cent. octadecanol in lard oil).
1970 Chem. & Physics Lipids IV. 246The major long-chain alcohols found in heart and brain tissues are hexadecanol, octadecanol and octadecenol.
1873 Watts Fownes'Chem. (ed. 11) 425The octammonio⁓diplatinic compounds consist of double molecules of tetrammonio-platinic compounds having two or more molecules.
1931 Chem. Rev. VIII. 390Curtius..found that when his triglycylglycine ester was heated to 100°C. in vacuo it was converted into an insoluble infusible material having the composition—NHCH2CO—. He assigned to this material the structure of a cyclic octapeptide, but a much more highly polymeric open chain structure seems more probable.
1957 Science 3 May 886/1 (heading) Synthesis and pharmacology of the octapeptide angiotonin.
1972 Lancet 17 June 1320/1 The superb work of Wieland and his school established that the toxins are either cyclic heptapeptides or octapeptides.
octa-
before vowels oct-, word-forming element meaning "eight," from Greek okta-, okt-, from PIE *okto(u) "eight" (see eight). The variant form octo- often appears in words taken from Latin, but the Greek form is said to be the more common in English.
ORIGIN: Greek okta- combining form of oktō eight. Cf. octo-
octa-
combining form. a variant of octo-, as in octachord.
[< Greek okta- < oktȱ eight]
octa-
combining form
or octo- also oct-
Etymology: Greek okta-, oktō-, okt- (from oktō) & Latin octo-, oct- (from octo) — more at eight
1. : eight
< Octacnemus >
< octamerous >
< octoploid >
< octose >
2. : containing eight atoms, groups, or equivalents
< octaacetate >
or octo- also oct-
1.
< Octacnemus >
< octamerous >
< octoploid >
< octose >
2.
< octaacetate >
octa-oct- octo- ogdo-
Prefix
- eight
Etymology
From Ancient Greek ὀκτά- (oktá-, “eight”), compare ὀκτώ (oktṓ).
Derived terms
前缀：octa- 表示“八”（亦作octo）
octagon 八角形（octa+gon角）
october 十月
octolateral 八边的（octo+lateral边的）
前缀：octa- 八(亦作octo-与oct-)
octageon 八角形
octosyllabel 八音节词
October （古罗马八月）十月
octolateral 八边的
octameter 八韵脚诗
octocentenary 八百周年纪念日
octavalent （化学）八价的