'Quadrantal triangle' definitions:

Definition of 'Quadrantal triangle'

From: GCIDE
  • 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]