Dictionary
5 ENTRIES FOUND:

trigonal

adjective tri·go·nal \trī-ˈgō-nəl\

Definition of TRIGONAL

:  of, relating to, or being the division of the hexagonal crystal system or the forms belonging to it characterized by a vertical axis of threefold symmetry
tri·go·nal·ly \-nəl-ē\ adverb

First Known Use of TRIGONAL

1878

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