HELIOSTAT

Etymology

Noun

heliostat (plural heliostats)

A device that includes a plane mirror which turns so as to keep reflecting sunlight toward a predetermined target, compensating for the sun's apparent motions in the sky. The target may be a physical object, distant from the heliostat, or a direction in space, and is almost always stationary relative to the heliostat, so the light is reflected in a fixed direction.

Anagrams

• loathiest, thiolates

Source: Wiktionary

He"li*o*stat, n. Etym: [Helio- + Gr. héliostate.]

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition