Opisthobranch


[uh-pis-thuh-brangk] /əˈpɪs θəˌbræŋk/

noun
1.
any gastropod mollusk of the order Opisthobranchia, as the sea slugs, sea butterflies, and sea hares, characterized by a vestigial or absent mantle and shell and two pairs of tentacles.
adjective
2.
of or relating to the opisthobranches.
/əˈpɪsθəˌbræŋk/
noun
1.
any marine gastropod of the class Opisthobranchia (or Opisthobranchiata), in which the shell is reduced or absent: includes the pteropods, sea hares, and nudibranchs

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