dimmer
A rheostat that is used to vary the intensity of a domestic electric light
Other meanings
A switch used to select between the low and high headlamp beam on a road vehicle. (usually as "dimmer switch", primarily in North America; elsewhere "dipswitch" or "dipper switch")
Where this comes from
This definition is adapted from “dimmer” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.