Triquetrous
adjective
1.
three-sided; triangular.
2.
having a triangular cross section.
adjective
1.
triangular, esp in cross section: a triquetrous stem
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noun, Classical History. 1. a galley with three rows or tiers of oars on each side, one above another, used chiefly as a warship. noun 1. a galley, developed by the ancient Greeks as a warship, with three banks of oars on each side