Meaning of branchial groove

bran'chial groove'

Pronunciation: [key]
— Embryol. Embryol.
  1. 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
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.