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triangular (adj.)

c. 1400, from Late Latin triangularis "triangular, pertaining to a triangle," from Latin triangulus "with three corners" (the usual adjective in classical Latin), as a noun, "a triangle;" see triangle. Related: Triangularly.

In the huts of witches all the instruments and implements are triangular. ["Handwörterbuch des deutschen Aberglaubens"]

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Definitions of triangular from WordNet

triangular (adj.)
having three angles; forming or shaped like a triangle;
a triangular pyrimid has a triangle for a base
a triangular figure
triangular (adj.)
having three sides;
Synonyms: trilateral / three-sided
From wordnet.princeton.edu