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n. A member of the order Dibranchiata, a classification formerly used for the two-gilled cephalopods, which include the octopuses, cuttlefish, and squids.

adj. Of or belonging to the order Dibranchiata.

adj. Having two gills.

n. Any of the Dibranchiata.

adj. Having two gills.

Having two gills; specifically, in cephalopods, pertaining to the Dibranchiata.

n. A cephalopod of the order Dibranchiata; a dibranch.

n. cephalopods having two gills

"It is said truly that the Ammonite, Orthoceras, and Nautilus of these ancient rocks were of the tetrabranchiate division, and none of them so highly organised as the Belemnite and other dibranchiate cephalopods which afterwards appeared, and some of which now flourish in our seas."

cephalopod mollusk    cephalopod