Definition of "dibranchiate" []

• A member of the order Dibranchiata, a classification formerly used for the two-gilled cephalopods, which include the octopuses, cuttlefish, and squids. (noun)
• Of or belonging to the order Dibranchiata. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "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."