quadrantal
(a.)四分圓的,象限的
Quad·ran·tal a. 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.
Quad·ran·tal, n.
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.]
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