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heliopora | heliopsis | helios | helioscope | heliosphere | heliostat | heliotherapy | heliothis | heliothis moth | heliothis zia | heliotrope

heliostat

 : 
Noun
 : 
he=li=o=stat

CIDE DICTIONARY

heliostatn. [Helio- + Gr. placed, standing, fr. to place, stand: cf. F. héliostate.].
     An instrument consisting of a mirror moved by clockwork, by which a sunbeam is made apparently stationary, by being steadily directed to one spot during the whole of its diurnal period; also, a geodetic heliotrope.  [1913 Webster]

OXFORD DICTIONARY

heliostat, n. an apparatus with a mirror driven by clockwork to reflect sunlight in a fixed direction.

Derivative
heliostatic adj.

For further exploring for "heliostat" in Webster Dictionary Online


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