searchlight

English Thesaurus

1. a light source with reflectors that projects a beam of light in a particular direction (noun.artifact)

hypernym	:	light, light source,
definition	:	any device serving as a source of illumination (noun.artifact)

part holonym	:	fresnel lens,
definition	:	lens composed of a number of small lenses arranged to make a lightweight lens of large diameter and short focal length (noun.artifact)