dimmer-switch

dimmer

[dim-er]
noun
1.
a person or thing that dims.
2.
Also called dimmer switch. a rheostat or similar device by which the intensity of an electric light may be varied.
3.
dimmers.
a.
the low-beam headlights of an automobile or truck.
b.
the small, parking lights of an automobile.

Origin:
1815–25; dim + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
dimmer (ˈdɪmə)
 
n
1.  a device, such as a rheostat, for varying the current through an electric light and thus changing the illumination
2.  (US) (often plural)
 a.  a dipped headlight on a road vehicle
 b.  a parking light on a car

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

dimmer
1822, agent noun from dim. Of mechanisms for reducing the brightness of electric lights, from 1905.
Online Etymology Dictionary, © 2010 Douglas Harper
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