| sector | 1. <geometry> 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. 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. Origin: L, properly, a cutter, fr. Secare, sectum, to cut: cf. F. Secteur. See Section. Source: Websters Dictionary (01 Mar 1998) |
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| sector scan | In ultrasonography, a system in which the transducer or transmitted ultrasound beam is rotated through an angle, resulting in a pie-shaped image. (05 Mar 2000) |
| sectoranopia | Loss of vision in a sector of the visual field. Origin: sector + G. An-priv. + opsis, vision (05 Mar 2000) |
| sectorial | <anatomy> Adapted for cutting. A sectorial, or carnassial, tooth. Source: Websters Dictionary (01 Mar 1998) |
| health care sector | Economic sector concerned with the provision, distribution, and consumption of health care services and related products. (12 Dec 1998) |
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| private sector | That distinct portion of the institutional, industrial, or economic structure of a country that is controlled or owned by non-governmental, private interests. (12 Dec 1998) |
| public sector | The area of a nation's economy that is tax-supported and under government control. (12 Dec 1998) |
| economic sector | A subdivision of economic activities based on major purpose (for example, "commercial sector" or "private sector"). (05 Dec 1998) |