1. (a.) Having three angles; having the form of a triangle.

2. (a.) Oblong or elongated, and having three lateral angles; as, a triangular seed, leaf, or stem.

cuneate cuneated cuneiform deltoid fan-shaped oxygonal three three-cornered three-dimensional three-footed three-in-one three-pronged three-sided triadic trial triangulate triarch trichotomous tricorn tricornered tricuspid trident tridental trifid triflorate triflorous trifurcate trigonal trigonoid trigrammatic trihedral trilateral trimerous trinal trine triparted tripartite triple triplex tripodic triquetral triquetrous trisected triune