dimmer

Pronunciation: /ˈdɪməː/

The English word “dimmer” has 2 meanings listed here.

noun

A rheostat that is used to vary the intensity of a domestic electric light
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")

From dim (verb) + -er.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.