What is the X in X-mas?
1888, from colon (n.2) + Modern Latin -stoma "opening, orifice," from Greek stoma "opening, mouth" (see stoma).
colostomy co·los·to·my (kə-lŏs'tə-mē)n.
Surgical construction of an artificial excretory opening from the colon.
The opening created by such a surgical procedure.