o·pis·tho·branch ( -p s th-br ngk )n. pl. o·pis·tho·branchs Any of various marine gastropod mollusks of the subclass Opisthobranchia, characterized by gills, a shell that is reduced or absent, and two pairs of tentacles. [From New Latin Opisthobranchia, order name : Greek opistho-, behind; see opisthognathous + Greek brankhia, gills.] |
opisthobranch [əˈpɪsθəˌbræŋk]
n
(Life Sciences & Allied Applications / 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]
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