Sector of a sphere
Sector Sec"tor, n. [L., properly, a cutter, fr. secare, sectum, to cut: cf. F. secteur. See {Section}.] 1. (Geom.) A part of a circle comprehended between two radii and the included arc. [1913 Webster]

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. [1913 Webster]

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. [1913 Webster]

{Dip sector}, an instrument used for measuring the dip of the horizon.

{Sector of a sphere}, or {Spherical sector}, the solid generated by the revolution of the sector of a circle about one of its radii, or, more rarely, about any straight line drawn in the plane of the sector through its vertex. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • sector of a sphere — the solid generated by the revolution of the sector of a circle about one of its radii …   Useful english dictionary

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  • Segment of a line — Segment Seg ment, n. [L. segmentum, fr. secare to cut, cut off: cf. F. segment. See {Saw} a cutting instrument.] 1. One of the parts into which any body naturally separates or is divided; a part divided or cut off; a section; a portion; as, a… …   The Collaborative International Dictionary of English

  • Sector — Sec tor, n. [L., properly, a cutter, fr. secare, sectum, to cut: cf. F. secteur. See {Section}.] 1. (Geom.) A part of a circle comprehended between two radii and the included arc. [1913 Webster] 2. A mathematical instrument, consisting of two… …   The Collaborative International Dictionary of English

  • sector — ► NOUN 1) an area or portion that is distinct from others. 2) a distinct part of an economy, society, or sphere of activity. 3) a subdivision of an area for military operations. 4) the plane figure enclosed by two radii of a circle or ellipse and …   English terms dictionary

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  • sphere — noun /sfɪə,sfɪr/ a) A regular three dimensional object in which every cross section is a circle; the figure described by the revolution of a circle about its diameter . Though cold and darkness longer hang somewhere, / Yet Phoebus equally lights… …   Wiktionary

  • sector — noun 1》 an area or portion that is distinct from others.     ↘a distinct part of an economy, society, or sphere of activity.     ↘a subdivision of an area for military operations. 2》 the plane figure enclosed by two radii of a circle or ellipse… …   English new terms dictionary

  • Dip sector — Sector Sec tor, n. [L., properly, a cutter, fr. secare, sectum, to cut: cf. F. secteur. See {Section}.] 1. (Geom.) A part of a circle comprehended between two radii and the included arc. [1913 Webster] 2. A mathematical instrument, consisting of… …   The Collaborative International Dictionary of English

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