trigonal
adjective
tri·go·nal
trī-ˈgō-nᵊl 
: 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
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“Trigonal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/trigonal. Accessed 26 Nov. 2024.
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