meaning of sector
1. A part of a circle comprehended between two radii and the included arc.
2. A mathematical instrument, consisting of two rulers connected at one end by a joint, each arm marked with several scales, as of equal parts, chords, sines, tangents, etc. , one scale of each kind on each arm, and all on lines radiating from the common center of motion. The sector is used for plotting, etc. , to any scale.
3. An astronomical instrument, the limb of which embraces a small portion only of a circle, used for measuring differences of declination too great for the compass of a micrometer. When it is used for measuring zenith distances of stars, it is called a zenith sector.
4. measuring instrument consisting of two graduated arms hinged at one end
Related Words
sector | sectoral | sectorial |
