Pronunciation: (stō"mu-dē'um, stom"u-), [key]
—pl. -de•aPronunciation: (-dē'u). [key] Embryol.
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.