/ Dictionary / Index F firestop: Meaning and Definition of Find definitions for: fire•stop Pronunciation: (fīr'stop"), [key] — n. any object built into a building frame to block a concealed hollow space through which a fire might pass from one part of the building to another. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. firestone firestorm Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language