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Meaning of stomodeum

sto•mo•de•um

Pronunciation: (stō"mu-dē'um, stom"u-), [key]
— pl. -de•a
  1. 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.