"Coelostat" validity in different word game dictionaries

Dictionary Validity
Scrabble US(US/Canada/Thailand - TWL/NWL) Yes
Scrabble UK(International - SOWPODS/CSW) Yes
Words with Friends(WWF) Yes

"coelostat" Definition

  1. an instrument consisting of an adjustable plane mirror clock-driven on an axis parallel to the axis of the earth and a second fixed mirror that act together to send light from a celestial body in a fixed direction— compare HELIOSTAT

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