searchlight -
a light source with reflectors that projects a beam of light in a particular direction
light source,
light any device serving as a source of illumination; "he stopped the car and turned off the lights"
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Wiktionary
Substantiv
searchlight -
A light source that projects a bright beam of light in any direction.
searchlight -
The light from the above source.
Wikipedia
A searchlight (or spotlight) is an apparatus that combines a bright light source with some form of curved reflector or other optics to projecting a powerful beam of light of approximately parallel rays in a particular direction, usually devised so that it can be swiveled about.
OmegaWiki Dictionary
Ω
searchlight An apparatus with reflectors for projecting a powerful beam of light of approximately parallel rays in a particular direction, usually devised so that it can be swiveled about.