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actinal
actinal, a. Zool. (ækˈtaɪnəl, ˈæktɪnəl) [f. Gr. ἀκτίς, ἀκτῖν-α ray + -al1.] Pertaining to that part or surface of a radiate animal which contains the mouth and surrounding organs, as the lower side of a starfish; a term introduced by L. Agassiz in connexion with his view that the body of a radiate a...
Oxford English Dictionary
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Pedicellaria
Depending on the species, pedicellariae may be surrounding the spines, on the surface of the animal's body, in pits on the abactinal, marginal, or actinal
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abactinal
abactinal, a. Zool. (ˌæbækˈtaɪnəl, ˌæbˈæktɪnəl) [f. L. ab away from + actinal.] Remote from the actinal area; pertaining to that part of the surface of a radiated animal which is opposite to the mouth, e.g. the apex of a sea-urchin, or upper surface of a star-fish. See actinal.1857 L. Agassiz Contri...
Oxford English Dictionary
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actinomere
actinomere Zool. (ækˈtɪnəmɪə(r)) [f. actino- + µέρ-ος part.] A portion of the surface of a radiated animal cut off by any two meridional lines reaching from pole to pole. See actinal.1869 Nicholson Zool. 111 Eight meridional bands, or ‘ctenophores,’ bearing the comb-like fringes, or characteristic o...
Oxford English Dictionary
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Heliaster microbrachius
The actinal surface is whitish, yellowish, or brownish, with pedicels much darker than spines.
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diactine
diactine, a. (and n.) Zool. (daɪˈæktɪn) [f. di-2 + actine 2.] Of a monaxon sponge spicule: having two rays, growing in both directions. Also as n., a spicule of this type. Hence diˈactinal a.1888 Sollas in Challenger Rep. XXV. p. liii, Diactine (diactina).—A monaxon in which growth proceeds in both ...
Oxford English Dictionary
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Brisingida
Other characteristics include a single series of marginals, a fused ring of disc plates, the lack of actinal plates, a spool-like ambulacral column, reduced
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aboral
aboral, a. Zool. (æˈbɔərəl) [f. L. ab away from + -oral, f. L. ōr- mouth.] Pertaining to the region of the animal body at the opposite extremity from the mouth. Used especially of those types of animal structure in which the mouth occupies one of the poles.1857 L. Agassiz Contrib. Nat. Hist. N. Amer...
Oxford English Dictionary
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octactinal
octactinal, a. Zool. (ɒktækˈtaɪnəl, -ˈæktɪnəl) [f. Gr. ὀκτώ or ὀκτα- eight + ἀκτίς, ἄκτῑν- ray + -al1: cf. actinal.] Having eight rays; spec. belonging to the Octactiniæ or Octocoralla, sub-class of Anthozoa (see octo-). So octacˈtinian a. and n.1888 Rolleston & Jackson Anim. Life 769 Jickeli sugges...
Oxford English Dictionary
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ab-
▪ I. ab- prefix repr. L. ab, prep. ‘off, away, from,’ cogn. w. Gr. ἀπό, Skr. apa, OTeut. af, OE. of, mod.E. of, off, mod.G. ab. In L. it was reduced to a- before p-, m-, and v-, became au- before f-, and abs- before c- and t-. The form ab- was in OFr. generally retained as in abusum, abus; sometimes...
Oxford English Dictionary
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oral
oral, a. (n.) (ˈɔərəl) [f. L. ōs, ōr- mouth + -al1. Cf. F. oral (18th c. in Hatz.-Darm.).] A. adj. 1. a. Uttered or communicated in spoken words; transacted by word of mouth; spoken, verbal. oral history: (the collection or study of) tape-recorded historical information concerning matters from the p...
Oxford English Dictionary
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tri-
tri-, prefix (traɪ, occas. trɪ) a. L. tri- and Gr. τρι-, combining form of trēs, τρεῖς three, τρίς thrice. The i, etymologically short in Greek and Latin, was in Latin sometimes lengthened, esp. in numerals (trīcēnī, trīgintā, etc.). In Eng. it is now usually long and diphthongal (aɪ), except in der...
Oxford English Dictionary
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