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S________
Definitions
A depression on the ectoderm of a developing embryo that becomes the mouth.
Word origin
From Ancient Greek στόμα (stóma, “mouth”) + a latinized and nominalized form of Ancient Greek ὁδαῖος (hodaîos, “on the way”). Compare proctodeum, urodeum, coprodeum, and phallodeum.
Source: Wiktionary, CC BY-SA 4.0
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