Etymology
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colostomy (n.)

1888, from combining form of colon (n.2) + Modern Latin -stoma "opening, orifice," from Greek stoma "opening, mouth" (see stoma). Colotomy "operation of making an incision in the colon" is attested from 1860, from Greek tome "a cutting."

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Definitions of colostomy

colostomy (n.)
a surgical operation that creates an opening from the colon to the surface of the body to function as an anus;
From wordnet.princeton.edu