search-light

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

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