(Quad*ran"tal) a. [L. quadrantalis containing the fourth fourth part of a measure.] (Geom.) Of or pertaining to a quadrant; also, included in the fourth part of a circle; as, quadrantal space.

Quadrantal triangle, a spherical triangle having one side equal to a quadrant or arc of 90°.Quadrantal versor, a versor that expresses rotation through one right angle.

1. (Rom. Antiq.) A cubical vessel containing a Roman cubic foot, each side being a Roman square foot; — used as a measure.

2. A cube. [R.]

1. (Print.) A block of type metal lower than the letters, — used in spacing and in blank lines. [Abbrev. quad.]

2. An old instrument used for taking altitudes; — called also geometrical square, and line of shadows.

(Quad"rate) a. [L. quadratus squared, p. p. of quadrare to make four-cornered, to make square, to square, to fit, suit, from quadrus square, quattuor four. See Quadrant, and cf. Quadrat, Quarry an arrow, Square.]

1. The fourth part; the quarter. [Obs.] Sir T. Browne.

2. (Geom.) 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.

3. (Anal. (Geom.) One of the four parts into which a plane is divided by the coördinate 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.

4. An instrument for measuring altitudes, variously constructed and mounted for different specific uses in astronomy, surveying, gunnery, etc., consisting commonly of a graduated arc of 90°, with an index or vernier, and either plain or telescopic sights, and usually having a plumb line or spirit level for fixing the vertical or horizontal direction.

By PanEris using Melati.

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