n. 1. comprising all living cephalopods except the family Nautilidae: the orders Octopoda (octopuses) and Decapoda (squids and cuttlefish). Syn. -- Dibranchiata, subclass ta, Dibranchia, subclass Dibranchia. [ WordNet 1.5 ]
‖n. pl. [ NL., fr. Gr. di- = di`s- twice + &unr_; gills. ] (Zool.) An order of cephalopods which includes those with two gills, an apparatus for emitting an inky fluid, and either eight or ten cephalic arms bearing suckers or hooks, as the octopi and squids. See Cephalopoda. [ 1913 Webster ]
‖n. pl. [ NL. See Nude, and Branchia. ] (Zool.) A division of opisthobranchiate mollusks, having no shell except while very young. The gills are naked and situated upon the back or sides. See Ceratobranchia. [ 1913 Webster ]
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