Pronunciation: (dim'ur), [key]
1. a person or thing that dims.
2. Also called dim'mer switch". a rheostat or similar device by which the intensity of an electric light may be varied.
a. the low-beam headlights of an automobile or truck.
b. the small, parking lights of an automobile.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.