triquadrantal

From tri- +‎ quadrantal.

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triquadrantal (not comparable)

1. (geometry) Having three quadrants.

   Coordinate term: biquadrantal

   A triquadrantal triangle is one whose three sides are quadrants, and whose three angles are consequently right angles.

• “triquadrantal”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.