/ Dictionary / Index S stomodeum: Meaning and Definition of Find definitions for: sto•mo•de•um Pronunciation: (stō"mu-dē'um, stom"u-), [key] — pl. -de•a a depression in the ectoderm of the oral region of a young embryo, which develops into the mouth and oral cavity. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. stomodaeum -stomous Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language