Also found in: Wikipedia.
|1.||A thin quadrant, made of brass, wood, etc., showing a stereographic projection on the plane of the equator. By it are found the hour of the day, the sun's azimuth, the altitude of objects in degrees, etc. See Gunter's scale.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.