dimmer

Etymology 1

dim (verb) + -er

noun

  1. A rheostat that is used to vary the intensity of a domestic electric light
  2. 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")

Etymology 2

dim (adjective) + -er

adj

  1. comparative form of dim: more dim

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