dome light

noun
1.
a small light under the roof of an automobile or boat.
2.
a flashing light on the roof of an emergency vehicle, as a police car or ambulance.
Also, domelight.


Origin:
1955–60

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Those in back will have to rely on the center dome light, because there are no
  reading lights, either.
Those that display an illuminated dome light can be hailed directly on the
  street, or you can order one by phone.
The fact that your dome light is on, and aimed at your dashboard, doesn't
  affect your speed north.
Each dome light shall be mounted on a dual-gang back box, minimum.
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