bran'chial cleft' of a series of slitlike openings in the walls of the pharynx between the branchial arches of fishes and aquatic amphibians through which water passes from the pharynx to the exterior. Also called visceral cleft.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

branchial archbranchial groove
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