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tripyramidal
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tripyramidal adj.
Brit. 
/ˌtrʌɪpᵻˈramᵻdl/
, /ˌtrʌɪpᵻˈramᵻdl/U.S. /ˌtraɪpəˈræməd(ə)l/
Crystallography characterized by three types of pyramid: applied to a class of the hexagonal system./ˌtraɪpəˈræməd(ə)l/<
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