/ Dictionary / Index B butterfat: Meaning and Definition of Find definitions for: but•ter•fat Pronunciation: (but'ur-fat"), [key] — n. butter; milk fat; a mixture of glycerides, mainly butyrin, olein, and palmitin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: butterfat (Thesaurus) buttercup squash butterfingers 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