QUADRANTAL

quadrantal. Quadrantal, a. having a fourth part of a circle

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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.