tail·light

[teyl-lahyt]
noun
a light, usually red, at the rear of an automobile, train, etc.
Also called tail lamp.


Origin:
1835–45; tail1 + light1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
taillight

noun
lamp (usually red) mounted at the rear of a motor vehicle 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Taillight is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a gadget; dingus; thingumbob.
Example sentences
To open this second compartment it was necessary to remove the rear taillight
  components.
Use a bright headlight, taillight, reflective material and light colored
  clothing at night and when visibility is poor.
In addition, other snowmobilers have believed the red headlight cap to actually
  be a taillight or brake light.
The lake supports swamp species, including the endangered taillight shiner and
  swamp darter.
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