/ Dictionary / Index S sigmoid: Meaning and Definition of Find definitions for: sig•moid Pronunciation: (sig'moid), [key] — adj. shaped like the letter C. shaped like the letter S. of, pertaining to, or situated near the sigmoid flexure of the large intestine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sigmoid (Thesaurus) sigmatism sigmoid flexure Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language