/ Dictionary / Index H hemicyclium: Meaning and Definition of Find definitions for: hem•i•cyc•li•um Pronunciation: (hem"i-sik'lē-um), [key] — n. a sundial in the form of a concave quarter sphere having a rodlike gnomon lying within one radius and marked on its surface with arcs that lie in the same plane as the gnomon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hemicycle hemidemisemiquaver 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