/ Dictionary / Index L lunate: Meaning and Definition of Find definitions for: lu•nate Pronunciation: (l'nāt), [key] — adj. crescent-shaped. —n. the second bone from the thumb side of the proximal row of bones of the carpus. a crescent-shaped, microlithic artifact mounted in a haft to form a composite tool, mostly Mesolithic in origin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lunate (Thesaurus) lunar year lunatic Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language