/ Dictionary / Index D defroster: Meaning and Definition of Find definitions for: de•frost•er Pronunciation: (di-frô'stur, -fros'tur), [key] — n. a person or thing that defrosts. Also calleda device for melting frost, ice, or condensation on a windshield or other window of an automobile, airplane, etc., by warming the window. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: defroster (Thesaurus) defrost defs. Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language