dimmer

名词 dimmer:

1. a rheostat that varies the current through an electric light in order to control the level of illumination

形容词 dim:

1. lacking in light; not bright or harsh
   同义词：dim, subdued
2. lacking clarity or distinctness
   同义词：dim, faint, shadowy, vague, wispy
3. made dim or less bright
   同义词：dimmed, dim
4. offering little or no hope
   同义词：black, bleak, dim
5. slow to learn or understand; lacking intellectual acuity
   同义词：dense, dim, dull, dumb, obtuse, slow

dim.mer

n.（名词）
A rheostat or other device used to vary the intensity of an electric light.
调光器：使电灯光减弱的一种变阻器或其它装置

A parking light on a motor vehicle.
汽车上的停车灯
Low beam.
车头的短焦距光