quadrantal (kwod rantal)

[= Sp. cuad rantal = Pg. quadrantal, part of a circle: as, a quadrantal space. Problems in Dialling, both Universal and Particular, and performed by the Lines inscribed on the Quadrantal Part of the Instrument. Quoted in N. and Q., 7th ser., VIII. 244. 2. Pertaining to the quadrans; of the value of a quadrans. - Quadrantal dial. See dial. - Quadrantal triangle, in trigon., a spherical triangle which has one side equal to a quadrant, or 90°.