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

Other words from trigonal

trigonally \trī-ˈgō-nᵊl-ē \ adverb

First Known Use of trigonal

1878, in the meaning defined above

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The first known use of trigonal was in 1878

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