trirectangular
Tri`rec*tan"gu*lar, a. Etym: [Pref. tri- + rectangular.] (Spherical Trig.) Defn: Having three right angles. See Triquadrantal.
Tri`rec*tan"gu*lar, a. Etym: [Pref. tri- + rectangular.] (Spherical Trig.) Defn: Having three right angles. See Triquadrantal.