/ Dictionary / Index B buttercup: Meaning and Definition of Find definitions for: but•ter•cup Pronunciation: (but'ur-kup"), [key] — n. any of numerous plants of the genus Ranunculus, having glossy yellow flowers and deeply cut leaves. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: buttercup (Thesaurus) buttercream buttercup family 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