What is "quadrantal"

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.

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.

Quadrantal \Quad*ran"tal\, n. [L.]

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.]

Etymology 1 n. An ancient Roman unit of measure for liquids. Etymology 2

a. (context geometry English) Of or relating to a quadrant, or included in the fourth part of a circle.