Etymology
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stoma (n.)

"orifice, small opening in an animal body," 1680s, Modern Latin, from Greek stoma (genitive stomatos) "mouth; mouthpiece; talk, voice; mouth of a river; any outlet or inlet," from PIE root *stom-en-, denoting various body parts and orifices (source also of Avestan staman- "mouth" (of a dog), Hittite shtamar "mouth," Middle Breton staffn "mouth, jawbone," Cornish stefenic "palate"). Surgical sense is attested from 1937.

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Definitions of stoma

stoma (n.)
a minute epidermal pore in a leaf or stem through which gases and water vapor can pass;
Synonyms: stomate / pore
stoma (n.)
a mouth or mouthlike opening (especially one created by surgery on the surface of the body to create an opening to an internal organ);
From wordnet.princeton.edu