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From The Collaborative International Dictionary of English v.0.48:
Quadrantal \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. [1913 Webster] Quadrantal triangle, a spherical triangle having one side equal to a quadrant or arc of 90[deg]. Quadrantal versor, a versor that expresses rotation through one right angle. [1913 Webster]