abactinaladj.

Brit.

/əˈbaktɪnəl/,

/aˈbaktɪnəl/, U.S.

/əˈbæktənəl/,

/æˈbæktənəl/

Origin: Formed within English, by derivation. Etymons: ab- prefix, actinal adj.

Etymology: < ab- prefix + actinal adj. N.E.D. (1884) gives the pronunciation as (æ:bˌæ̆ktəi·năl, æ:bˌæ·ktinăl) /ˌæbækˈtaɪnəl/, /ˌæbˈæktɪnəl/.

Zoology.

Designating the part or surface of an echinoderm or other radiate animal that is furthest from the mouth (as the upper side of a starfish); relating to this part; = aboral adj. 1. Cf. actinal adj.

ΘΚΠ

the world > animals > invertebrates > Radiata > [adjective] > relating to part opposed to mouth

abactinal1857

1857 L. J. R. Agassiz Contrib. Nat. Hist. U.S.A. IV. 376 I have called this side..the oral or actinal area, and the opposite side the aboral or abactinal area.

1881 Nature 10 Nov. 41 The abactinal system and ambulacral plates of a Cidarid combined with the thin test and hollow spines of a Diadema.

1937 Jrnl. Paleontol. 11 621/2 The abactinal surface is unknown; dorsal spines protrude along ray margins.

1988 Proc. Royal Soc. B. 233 451 The form of the abactinal plates..in Xyloplax is not dissimilar to that of ophiurans..which are known to live in the same habitat.

2005 Biol. Bull. 209 119/2 Both hybrids exhibited..the long slender abactinal spines with a wreath of minor pedicellariae halfway up these spines typical of A[sterias] rubens.

Derivatives

abˈactinally adv. on or towards the abactinal surface; = aborally adv.; cf. actinally adv. at actinal adj. Derivatives.

ΘΚΠ

the world > animals > animal body > general parts > [adverb] > in aboral position or direction

aborally1866

abactinally1883

1883 P. M. Duncan & W. P. Sladen Monogr. Tertiary Echinoidea Kachh & Kattywar 16 The poriferous zones are well developed abactinally.

1936 Jrnl. Paleontol. 10 432/2 This type occurs chiefly among the primary spines of the actinal half of the test, but may also be conspicuous abactinally.

2008 Neues Jahrbuch Geol. & Paläontol. 247 153/1 The external face is slightly depressed on the abradial side, and becomes flattened abactinally.

This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021).

单词	abactinal
释义	abactinaladj. Brit. /əˈbaktɪnəl/, /aˈbaktɪnəl/, U.S. /əˈbæktənəl/, /æˈbæktənəl/ Origin: Formed within English, by derivation. Etymons: ab- prefix, actinal adj. Etymology: < ab- prefix + actinal adj. N.E.D. (1884) gives the pronunciation as (æ:bˌæ̆ktəi·năl, æ:bˌæ·ktinăl) /ˌæbækˈtaɪnəl/, /ˌæbˈæktɪnəl/. Zoology. Designating the part or surface of an echinoderm or other radiate animal that is furthest from the mouth (as the upper side of a starfish); relating to this part; = aboral adj. 1. Cf. actinal adj. ΘΚΠ the world > animals > invertebrates > Radiata > [adjective] > relating to part opposed to mouth abactinal1857 1857 L. J. R. Agassiz Contrib. Nat. Hist. U.S.A. IV. 376 I have called this side..the oral or actinal area, and the opposite side the aboral or abactinal area. 1881 Nature 10 Nov. 41 The abactinal system and ambulacral plates of a Cidarid combined with the thin test and hollow spines of a Diadema. 1937 Jrnl. Paleontol. 11 621/2 The abactinal surface is unknown; dorsal spines protrude along ray margins. 1988 Proc. Royal Soc. B. 233 451 The form of the abactinal plates..in Xyloplax is not dissimilar to that of ophiurans..which are known to live in the same habitat. 2005 Biol. Bull. 209 119/2 Both hybrids exhibited..the long slender abactinal spines with a wreath of minor pedicellariae halfway up these spines typical of A[sterias] rubens. Derivatives abˈactinally adv. on or towards the abactinal surface; = aborally adv.; cf. actinally adv. at actinal adj. Derivatives. ΘΚΠ the world > animals > animal body > general parts > [adverb] > in aboral position or direction aborally1866 abactinally1883 1883 P. M. Duncan & W. P. Sladen Monogr. Tertiary Echinoidea Kachh & Kattywar 16 The poriferous zones are well developed abactinally. 1936 Jrnl. Paleontol. 10 432/2 This type occurs chiefly among the primary spines of the actinal half of the test, but may also be conspicuous abactinally. 2008 Neues Jahrbuch Geol. & Paläontol. 247 153/1 The external face is slightly depressed on the abradial side, and becomes flattened abactinally. This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021). < adj.1857
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