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bran'chial groove'

one of a series of rudimentary depressions on the surface of the embryo between adjacent branchial arches, homologous to the branchial clefts of gill-breathing ancestral forms. Also called visceral groove.

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

branchial cleftbranchial pouch


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