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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.
Also, opisthobranchiate
[uh-pis-thuh-brang-kee-it, -eyt] /əˌpɪs θəˈbræŋ ki ɪt, -ˌeɪt/ (Show IPA)
.
Origin of opisthobranch
1850-1855
1850-55; < New Latin Opisthobranchia the subclass; see opistho-, branchia
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Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for opisthobranch

opisthobranch

/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
Word Origin
via New Latin from Greek opisthen behind + -branch
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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