octa-comb. form

Stress is usually determined by a subsequent element and vowels may be reduced accordingly.

Origin: A borrowing from Greek. Etymon: Greek ὀκτα-.

Etymology: < ancient Greek ὀκτα- eight- (in e.g. ὀκτάχορδος octachord adj.), alteration (after ἑπτα- hepta- comb. form) of ὀκτώ- octo- comb. form.Attested earliest in the second half of the 16th cent. in a small number of words ultimately of Greek origin in geometry (octahedron n., octagon n., octagonal adj., all partly via Latin, and octagonian adj., an adaptation of an Italian word) and in prosody (octastich n., directly < Greek), and in the 17th and 18th centuries in a larger number of classical loans from a variety of subject areas (as e.g. Octateuch n., octachord n., octaples n., etc.). English formations are found from the middle of the 19th cent., earliest in octamerous adj., and occur throughout the 19th and 20th centuries in formations from technical and scientific registers, especially in chemistry. The second element of compounds in octa- is usually ultimately of Greek or Latin origin. A number of words in octa- have variants in octo- (see e.g. forms at octahedron n., octameter n., octadecyl n., octacarbon n. at sense 2a beside contemporaneous octocarbon n. at octo- comb. form 1, etc.). In many cases this is probably due to remodelling after octo- comb. form, the more usual combining form in English. However, in other (especially earlier) words it probably reflects similar variation in classical Latin and post-classical Latin words ultimately < ancient Greek ὀκτα- which apparently show substitution of classical Latin octō- octo- comb. form for this element: see e.g. forms and discussion at octagon n. and adj., Octateuch n., octachord n. and adj.; the same variation occurs also in French (see e.g. French forms cited s.vv.). For the converse phenomenon, see further discussion s.v. octo- comb. form. The position of the stress differs between compounds of octa- in accordance with the general stress patterns of English.

1. Forming adjectives and nouns in the sense ‘consisting of or having eight ——’. Most of the English derivatives of octa- appear in their places as main words; the following are of minor importance:

† octachronous adj. [ < octa- comb. form + -chronous comb. form, after Byzantine Greek ὀκτάχρονος] Prosody Obsolete rare = octasemic adj.Apparently only attested in dictionaries or glossaries.

ΚΠ

1891 Cent. Dict. Octachronous, having a magnitude of eight primary or fundamental.

† octacolic adj. [ < octa- comb. form +colon n.² + -ic suffix, after Greek ὀκτάκωλος in scholia (medieval Greek or earlier) on Aristophanes Acharnians 565] Prosody Obsolete rare consisting of eight cola.Apparently only attested in dictionaries or glossaries.

ΚΠ

1891 Cent. Dict. (at cited word) An octacolic period.

† octaphonic adj. [ < octa- comb. form + -phonic comb. form] Music Obsolete (of a musical composition) having eight parts or voices.

ΚΠ

1891 Cent. Dict. Octaphonic, noting a composition for eight voice-parts.

† octapodic adj. [ < octa- comb. form + -podic comb. form] Prosody Obsolete rare containing eight metrical feet.Apparently only attested in dictionaries or glossaries.

ΚΠ

1891 Cent. Dict. Octapodic, consisting of or containing eight feet.

octapody n.

Brit.

/ɒkˈtapədi/

U.S.

/ɑkˈtæpədi/

Prosody rare a verse of eight feet.

ΘΚΠ

society > leisure > the arts > literature > poetry > versification > metre > [noun] > variety of > octameter

octonarius1819

octonare1886

octameter1889

octapody1891

octonarian1892

1891 Cent. Dict. (at cited word) An octapody exceeds the limits of a colon, and is generally written as two lines.

1900 H. W. Smyth Greek Melic Poets 195 We might arrange (the passage) in Octapodies.

† octasemic adj. [ < octa- comb. form + seme n. + -ic suffix, after post-classical Latin octasemus (4th cent.), Greek ὀκτάσημος in scholia (medieval Greek or earlier) on Aeschylus Seven against Thebes 103] Prosody Obsolete rare containing eight morae or units of time.Apparently only attested in dictionaries or glossaries.

ΚΠ

1891 Cent. Dict. (at cited word) The orthius has as octasemic thesis.

† octastrophic adj. Prosody Obsolete rare consisting of eight strophes or stanzas.Apparently only attested in dictionaries or glossaries.

ΚΠ

1891 Cent. Dict. (at cited word) An octastrophic poem.

a. Chemistry and Biochemistry. Forming terms in which octa- signifies the presence in a molecule of eight atoms, radicals, etc., indicated by the word or element to which octa- is prefixed (cf. octo- comb. form).

octacarbon n.

Brit.

/ˈɒktəˌkɑːb(ə)n/

U.S.

/ˈɑktəˌkɑrbən/

ΚΠ

1902 N.E.D. at Octa- Octacarbon.

1997 Chem. Physics Lett. 280 227 Highly symmetric octacarbon clusters, i.e. a cube (O_h), a twisted cube (T_d), a tricyclic cage (C_3v) and a planar (D_4h) structure.

octapeptide n.

Brit.

/ˌɒktəˈpɛptʌɪd/

U.S.

/ˌɑktəˈpɛpˌtaɪd/

a peptide whose molecules are composed of eight amino-acid residues.

ΚΠ

1931 Chem. Rev. 8 390 Curtius..assigned to this material the structure of a cyclic octapeptide, but a much more highly polymeric open chain structure seems more probable.

1972 Lancet 17 June 1320/1 The superb work of Wieland and his school established that the toxins are either cyclic heptapeptides or octapeptides.

1990 Nucleic Acids Res. 18 261/2 An octapeptide sequence, which was later shown to map near the carboxy terminus, was obtained from a tryptic fragment.

This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022).

单词	octa-
释义	octa-comb. form Stress is usually determined by a subsequent element and vowels may be reduced accordingly. Origin: A borrowing from Greek. Etymon: Greek ὀκτα-. Etymology: < ancient Greek ὀκτα- eight- (in e.g. ὀκτάχορδος octachord adj.), alteration (after ἑπτα- hepta- comb. form) of ὀκτώ- octo- comb. form.Attested earliest in the second half of the 16th cent. in a small number of words ultimately of Greek origin in geometry (octahedron n., octagon n., octagonal adj., all partly via Latin, and octagonian adj., an adaptation of an Italian word) and in prosody (octastich n., directly < Greek), and in the 17th and 18th centuries in a larger number of classical loans from a variety of subject areas (as e.g. Octateuch n., octachord n., octaples n., etc.). English formations are found from the middle of the 19th cent., earliest in octamerous adj., and occur throughout the 19th and 20th centuries in formations from technical and scientific registers, especially in chemistry. The second element of compounds in octa- is usually ultimately of Greek or Latin origin. A number of words in octa- have variants in octo- (see e.g. forms at octahedron n., octameter n., octadecyl n., octacarbon n. at sense 2a beside contemporaneous octocarbon n. at octo- comb. form 1, etc.). In many cases this is probably due to remodelling after octo- comb. form, the more usual combining form in English. However, in other (especially earlier) words it probably reflects similar variation in classical Latin and post-classical Latin words ultimately < ancient Greek ὀκτα- which apparently show substitution of classical Latin octō- octo- comb. form for this element: see e.g. forms and discussion at octagon n. and adj., Octateuch n., octachord n. and adj.; the same variation occurs also in French (see e.g. French forms cited s.vv.). For the converse phenomenon, see further discussion s.v. octo- comb. form. The position of the stress differs between compounds of octa- in accordance with the general stress patterns of English. 1. Forming adjectives and nouns in the sense ‘consisting of or having eight ——’. Most of the English derivatives of octa- appear in their places as main words; the following are of minor importance: † octachronous adj. [ < octa- comb. form + -chronous comb. form, after Byzantine Greek ὀκτάχρονος] Prosody Obsolete rare = octasemic adj.Apparently only attested in dictionaries or glossaries. ΚΠ 1891 Cent. Dict. Octachronous, having a magnitude of eight primary or fundamental. † octacolic adj. [ < octa- comb. form +colon n.² + -ic suffix, after Greek ὀκτάκωλος in scholia (medieval Greek or earlier) on Aristophanes Acharnians 565] Prosody Obsolete rare consisting of eight cola.Apparently only attested in dictionaries or glossaries. ΚΠ 1891 Cent. Dict. (at cited word) An octacolic period. † octaphonic adj. [ < octa- comb. form + -phonic comb. form] Music Obsolete (of a musical composition) having eight parts or voices. ΚΠ 1891 Cent. Dict. Octaphonic, noting a composition for eight voice-parts. † octapodic adj. [ < octa- comb. form + -podic comb. form] Prosody Obsolete rare containing eight metrical feet.Apparently only attested in dictionaries or glossaries. ΚΠ 1891 Cent. Dict. Octapodic, consisting of or containing eight feet. octapody n. Brit. /ɒkˈtapədi/ , U.S. /ɑkˈtæpədi/ Prosody rare a verse of eight feet. ΘΚΠ society > leisure > the arts > literature > poetry > versification > metre > [noun] > variety of > octameter octonarius1819 octonare1886 octameter1889 octapody1891 octonarian1892 1891 Cent. Dict. (at cited word) An octapody exceeds the limits of a colon, and is generally written as two lines. 1900 H. W. Smyth Greek Melic Poets 195 We might arrange (the passage) in Octapodies. † octasemic adj. [ < octa- comb. form + seme n. + -ic suffix, after post-classical Latin octasemus (4th cent.), Greek ὀκτάσημος in scholia (medieval Greek or earlier) on Aeschylus Seven against Thebes 103] Prosody Obsolete rare containing eight morae or units of time.Apparently only attested in dictionaries or glossaries. ΚΠ 1891 Cent. Dict. (at cited word) The orthius has as octasemic thesis. † octastrophic adj. Prosody Obsolete rare consisting of eight strophes or stanzas.Apparently only attested in dictionaries or glossaries. ΚΠ 1891 Cent. Dict. (at cited word) An octastrophic poem. 2. a. Chemistry and Biochemistry. Forming terms in which octa- signifies the presence in a molecule of eight atoms, radicals, etc., indicated by the word or element to which octa- is prefixed (cf. octo- comb. form). octacarbon n. Brit. /ˈɒktəˌkɑːb(ə)n/ , U.S. /ˈɑktəˌkɑrbən/ ΚΠ 1902 N.E.D. at Octa- Octacarbon. 1997 Chem. Physics Lett. 280 227 Highly symmetric octacarbon clusters, i.e. a cube (O_h), a twisted cube (T_d), a tricyclic cage (C_3v) and a planar (D_4h) structure. b. octapeptide n. Brit. /ˌɒktəˈpɛptʌɪd/ , U.S. /ˌɑktəˈpɛpˌtaɪd/ a peptide whose molecules are composed of eight amino-acid residues. ΚΠ 1931 Chem. Rev. 8 390 Curtius..assigned to this material the structure of a cyclic octapeptide, but a much more highly polymeric open chain structure seems more probable. 1972 Lancet 17 June 1320/1 The superb work of Wieland and his school established that the toxins are either cyclic heptapeptides or octapeptides. 1990 Nucleic Acids Res. 18 261/2 An octapeptide sequence, which was later shown to map near the carboxy terminus, was obtained from a tryptic fragment. This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022). < comb. form1891
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