[tri.an.gu.lar] adj [LL triangularis, fr. L triangulum] (1541) 1 a: of, relating to, or having the form of a triangle "a ~ plot of land" b: having a triangular base or principal surface "a ~ table" "a ~ pyramid"
2. a (1): of, relating to, or involving three elements "the ~ mother-father-child relationship" (2) of a military group: based primarily on three units "~ division" b: of or relating to a love triangle "a ~ love affair" -- tri.an.gu.lar.i.ty n -- tri.an.gu.lar.ly adv