searchlight

[surch-lahyt]
noun
1.
a device, usually consisting of a light and reflector, for throwing a beam of light in any direction.
2.
a beam of light so thrown.

Origin:
1880–85; search + light1

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World English Dictionary
searchlight (ˈsɜːtʃˌlaɪt)
 
n
1.  a device, consisting of a light source and a reflecting surface behind it, that projects a powerful beam of light in a particular direction
2.  the beam of light produced by such a device

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

searchlight

high-intensity electric light with a reflector shaped to concentrate the beam, used to illuminate or search for distant objects or as a beacon.

Learn more about searchlight with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Imagine trying to spot a moth flying around the rim of a searchlight.
As long as it provides enough light to see, it doesn't have to be a searchlight.
The searchlight beams on the right had picked up an enemy raider.
As the machine's name implies, its beam will be continuous and will resemble a
  powerful searchlight rather than a strobe lamp.
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