/ Dictionary / Index D dimmer: Meaning and Definition of Find definitions for: dim•mer Pronunciation: (dim'ur), [key] — n. a person or thing that dims. Also calleda rheostat or similar device by which the intensity of an electric light may be varied. the low-beam headlights of an automobile or truck. the small, parking lights of an automobile. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dimmer (Thesaurus) dimity dimorph Related Content Daily Word Quiz: reclusive Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language