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Definition of: goniometer
(gō′nē· om′ə·tər) noun
1. An instrument for measuring angles, as in crystallography, surveying, etc., either by direct contact as in the contact goniometer, or more accurately, by utilizing beams of light, as in the reflecting goniometer.
2. An electrical direction-finder for aircraft.
—go·ni·o·met·ric (gō′nē·ə·meţ′rik) or ·ri·cal adjective
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