os·to·my 
(ŏstə-mē)
(ŏstə-mē)n. pl. os·to·mies
Surgical construction of an artificial excretory opening, as a colostomy or ileostomy.
[From (COL)OSTOMY.]
- overcoat
- overcoating
- overcome
- overcommit
- overcommitment
- overcompensate
- overcompensation
- overcompensatory
- overconfidence
- overconfident
- overconfidently
- overcorrect
- overcorrection
- overcritical
- overcritically
- overcrop
- overcrowd
- overdevelop
- overdevelopment
- overdiagnose
- overdiagnosis
- overdo
- overdoer
- overdog
- overdominance