Where does “nontriangular” come from?
nontriangular (English) comes from English triangular, from Latin triangulare, from French triangulaire, from Latin triangularis, from Latin triangulus, from Latin Angulus, from Proto-Indo-European h₂engulos, from Proto-Indo-European h₂eng- — curve, bend.
nontriangular (English): Not triangular
Ancestry of “nontriangular”, step by step