actinostomen.
/ˈaktᵻnə(ʊ)ˌstəʊm/, U.S. /ˈæktənoʊˌstoʊm/ Zoology.
The mouth or oral opening of a radiate animal, such as a coelenterate or (now usually) an echinoderm.
ΚΠ
1860 L. J. R. Agassiz Contrib. Nat. Hist. U.S.A. III. i. ii. 77 At one end of this axis we invariably find the so-called mouth or actinostome.
1888 G. B. Goode Amer. Fishes 222 The little fish seem to rise at the approach of danger and seek refuge among the lobes of the actinostome [sc. of a jellyfish].
1966 Deep-sea Res. 13 690 Each mouth plate bears a webbed series of spines on the margin toward the actinostome.
1979 Jrnl. Paleontol. 53 1151/2 Disc small, slightly tumid; interbrachial angles acute; actinostome probably deep.
This entry has been updated (OED Third Edition, November 2010; most recently modified version published online December 2021).
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