/ Dictionary / Index P proctosigmoidoscope: Meaning and Definition of Find definitions for: proc•to•sig•moid•o•scope Pronunciation: (prok"tō-sig-moi'du-skōp"), [key] — n. sigmoidoscope. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. proctoscopy proctosigmoidoscopy Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language