/ Dictionary / Index S semilunar: Meaning and Definition of Find definitions for: sem•i•lu•nar Pronunciation: (sem"ē-l'nur, sem"ī-), [key] — adj. shaped like a half-moon; crescent. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: semilunar (Thesaurus) semilogarithmic semilunar bone 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