/ Dictionary / Index F fire clay: Meaning and Definition of Find definitions for: fire' clay" Pronunciation: [key] a refractory clay used for making crucibles, firebricks, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fireclay (Thesaurus) fire chief fire code Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language