a light, usually red, at the rear of an automobile, train, etc.
Also called tail lamp.

1835–45; tail1 + light1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To taillight
Example sentences
In addition, other snowmobilers have believed the red headlight cap to actually
  be a taillight or brake light.
Operation at night-When operating during the hours between dusk and dawn a
  snowmobile must use a lighted headlight and taillight.
The lake contains swamp species, including the endangered taillight shiner and
  swamp darter.
Use a bright headlight, taillight, reflective material and light colored
  clothing at night and when visibility is poor.
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