English definition of Quadrant

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Definition of quadrant

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Quadrant (n.) One of the four parts into which a plane is divided by the coordinate axes. The upper right-hand part is the first quadrant; the upper left-hand part the second; the lower left-hand part the third; and the lower right-hand part the fourth quadrant.

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Octant :: Octant (n.) An instrument for measuring angles (generally called a quadrant), having an arc which measures up to 9O¡, but being itself the eighth part of a circle. Cf. Sextant..

Altimeter :: Altimeter (n.) An instrument for taking altitudes, as a quadrant, sextant, etc..

Quadrant :: Quadrant (n.) One of the four parts into which a plane is divided by the coordinate axes. The upper right-hand part is the first quadrant; the upper left-hand part the second; the lower left-hand part the third; and the lower right-hand part the fourth quadrant.

Azimuth :: Azimuth (n.) The quadrant of an azimuth circle.

Pelecoid :: Pelecoid (n.) A figure, somewhat hatched-shaped, bounded by a semicircle and two inverted quadrants, and equal in area to the square ABCD inclosed by the chords of the four quadrants..

Sinical :: Sinical (a.) Of or pertaining to a sine; employing, or founded upon, sines; as, a sinical quadrant..

Semiquartile :: Semiquartile (n.) An aspect of the planets when distant from each other the half of a quadrant, or forty-five degrees, or one sign and a half..

Sight :: Sight (v. t.) A small aperture through which objects are to be seen, and by which their direction is settled or ascertained; as, the sight of a quadrant..

Quadrantes :: Quadrantes (pl. ) of Quadran.

Quadrantal :: Quadrantal (a.) Of or pertaining to a quadrant; also, included in the fourth part of a circle; as, quadrantal space..

Gunter''s Quadrant :: Gunter's quadrant () 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..

Quadrantal :: Quadrantal (n.) A cube.

Sextant :: Sextant (n.) An instrument for measuring angular distances between objects, -- used esp. at sea, for ascertaining the latitude and longitude. It is constructed on the same optical principle as Hadley's quadrant, but usually of metal, with a nicer graduation, telescopic sight, and its arc the sixth, and sometimes the third, part of a circle. See Quadrant..

Triquadrantal :: Triquadrantal (a.) Having three quadrants; thus, a triquadrantal triangle is one whose three sides are quadrants, and whose three angles are consequently right angles..

Quadrant :: Quadrant (n.) The quarter of a circle, or of the circumference of a circle, an arc of 90¡, or one subtending a right angle at the center..

Vane :: Vane (n.) One of the sights of a compass, quadrant, etc..

Alidade :: Alidade (n.) The portion of a graduated instrument, as a quadrant or astrolabe, carrying the sights or telescope, and showing the degrees cut off on the arc of the instrument.

Antimeter :: Antimeter (n.) A modification of the quadrant, for measuring small angles..

Trirectangular :: Trirectangular (a.) Having three right angles. See Triquadrantal.

Backstaff :: Backstaff (n.) An instrument formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; -- so called because the observer turned his back to the body observed..