Might mean (unverified): Not having three angles, vertices.
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We found one dictionary that defines the word nontrigonal:

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  1. nontrigonal: Wiktionary

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Definitions from Wiktionary (nontrigonal)

▸ adjective:  Not trigonal.

Similar:
nontetragonal, nontetrahedral, nondihedral, nontriangular, nonhexagonal, nonorthorhombic, nonquadrilateral, nonmerohedral, nonprismatic, nonplanar, more...

Opposite:
trigonal, triangular, three-sided

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Similar:
nontetragonal, nontetrahedral, nondihedral, nontriangular, nonhexagonal, nonorthorhombic, nonquadrilateral, nonmerohedral, nonprismatic, nonplanar, more...

Opposite:
trigonal, triangular, three-sided



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