Noun | 1. | ![]() animal order - the order of animals Dibranchia, Dibranchiata, subclass Dibranchia, subclass Dibranchiata - comprising all living cephalopods except the family Nautilidae: the orders Octopoda (octopuses) and Decapoda (squids and cuttlefish) Belemnitidae, family Belemnitidae - family of extinct Mesozoic cephalopods |