The Collaborative International Dictionary
Triquetrous
Triquetrous \Tri*que"trous\, a. [L. triquetrus.] Three sided, the sides being plane or concave; having three salient angles or edges; trigonal.
Wiktionary
triquetrous
a. Having three corners or sides; triangular.
WordNet
Usage examples of "triquetrous".
It is a native of Albania, and belongs to that section of its extensive genus having triquetrous and obtuse leaves, or blunt three-sided foliage, as formed by a well developed keel.