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opisthobranchenUK
o·pis·tho·branch O0096800 (ə-pĭs′thə-brăngk′)n. pl. o·pis·tho·branchs Any of a group of marine gastropods characterized by gills located behind the heart, a shell that is reduced or absent, and two pairs of tentacles, and including the sea slugs and the sea butterflies.
[From New Latin Opisthobranchia, former subclass name : Greek opistho-, behind; see opisthognathous + Greek brankhia, gills.]opisthobranch (əˈpɪsθəˌbræŋk) n (Animals) any marine gastropod of the class Opisthobranchia (or Opisthobranchiata), in which the shell is reduced or absent: includes the pteropods, sea hares, and nudibranchs[via New Latin from Greek opisthen behind + -branch]o•pis•tho•branch (əˈpɪs θəˌbræŋk) also o•pis•tho•bran•chi•ate (əˌpɪs θəˈbræŋ ki ɪt, -ˌeɪt)
n. any gastropod mollusk of the order Opisthobranchia, characterized by a small or absent mantle and shell and by two pairs of tentacles: includes the sea slugs and pteropods. [1850–55; < New Latin Opisthobranchia; see opistho-, branchia]
EncyclopediaSeeOpisthobranchiaopisthobranchenUK
opisthobranch any member of the molluscan subclass Opisthobranchia -marine forms mainly lacking shells, such as sea slugs. |