Etymology
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tracheostomy (n.)

1726, from tracheo-, used as a combining form of trachea + -ostomy "artificial opening," from Modern Latin stoma "opening, orifice," from Greek stoma "mouth" (see stoma).

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Definitions of tracheostomy

tracheostomy (n.)
a surgical operation that creates an opening into the trachea with a tube inserted to provide a passage for air; performed when the pharynx is obstructed by edema or cancer or other causes;
Synonyms: tracheotomy
From wordnet.princeton.edu