Defn: Having three quadrants; thus, a triquadrantal triangle is one whose three sides are quadrants, and whose three angles are consequently right angles.
TRIQUETRAL
Tri*que"tral, a.
Defn: Triquetrous.
TRIQUETROUS
Tri*que"trous, a. Etym: [L. triquetrus.]
Defn: Three sided, the sides being plane or concave; having three salient angles or edges; trigonal.
TRIQUETRUM
Tri*que"trum, n.; pl. Triquetra. Etym: [NL.] (Anat.)
Defn: One of the bones of the carpus; the cuneiform. See Cuneiform (b).
TRIRADIATE; TRIRADIATED
Tri*ra"di*ate, Tri*ra"di*a`ted, a. Etym: [Pref. tri- + radiate.]
Defn: Having three rays.
TRIRECTANGULAR
Tri`rec*tan"gu*lar, a. Etym: [Pref. tri- + rectangular.] (Spherical
Trig.)