Answer | Crossword Clue |
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heliostats | An apparatus containing a movable or driven mirror, used to reflect sunlight in a fixed direction |
heliostat | an instrument using a mirror to reflect sunlight in a fixed direction, used for studying the sun or signalling messages |
heliostats | HELIOSTAT, an instrument using a mirror to reflect sunlight in a fixed direction, used for studying the sun or signalling messages |