/ Dictionary / Index B branchial groove: Meaning and Definition of Find definitions for: bran'chial groove' Pronunciation: [key] — Embryol. Embryol. 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. branchial cleft branchial pouch Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language