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;
Quadrantal triangle,
Quadrantal versor,
n. [ L. ]
a. [ Pref. tri- + quadrantal. ] (Spherical Trig.) Having three quadrants; thus, a triquadrantal triangle is one whose three sides are quadrants, and whose three angles are consequently right angles. [ 1913 Webster ]
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