Meaning of procto

proc•to

Pronunciation: (prok'tō), [key]
— pl. -tos.
  1. proctosigmoidoscopy.

procto-

Pronunciation: [key]
  1. a combining form meaning “anus,” “rectum,” used in the formation of compound words: proctoscope.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.