/ Dictionary / Index H hemicycle: Meaning and Definition of Find definitions for: hem•i•cy•cle Pronunciation: (hem'i-sī"kul), [key] — n. a semicircle. a semicircular structure. hemicyclium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hemicycle (Thesaurus) hemicrania hemicyclium Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language