triantán dronuilleach

== Irish == === Noun === triantán dronuilleach m (genitive singular triantáin dhronuilligh, nominative plural triantáin dhronuilleacha) (geometry) right-angled triangle, right triangle === Mutation === === Further reading === “right-angled+triangle”, in New English-Irish Dictionary, Foras na Gaeilge, 2013–2026