/ Dictionary / Index F fat cell: Meaning and Definition of Find definitions for: fat' cell" Pronunciation: [key] — Biol. Biol. a cell in loose connective tissue that is specialized for the synthesis and storage of fat. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fat cat Fat City Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language