/ Dictionary / Index R Rathke's pouch: Meaning and Definition of Find definitions for: Rath'ke's pouch' Pronunciation: (rät'kuz), [key] — Embryol. Embryol. an invagination of stomodeal ectoderm developing into the anterior lobe of the pituitary gland. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rather rathole Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language