Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun 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 The Century Dictionary.

  • noun A member of the Opisthobranchiata.
  • Having posterior gills; specifically, of or pertaining to the Opisthobranchiata.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Any of a large and diverse group of specialized complex marine gastropods previously united under Opisthobranchia within the Heterobranchia, characterized by two pairs of tentacles and a single gill behind and to the right of the heart.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[From New Latin Opisthobranchia, former subclass name : Greek opistho-, behind; see opisthognathous + Greek brankhia, gills.]

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Examples

  • Aldabra supports little besides tortoises, beach flies, opisthobranch mollusks, and polychaete worms.

    The Song of The Dodo David Quammen 2004

  • Aldabra supports little besides tortoises, beach flies, opisthobranch mollusks, and polychaete worms.

    The Song of The Dodo David Quammen 2004

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