tetartohedral

adjective
te·​tar·​to·​he·​dral | \te-ˌtär-tə-ˈhē-drəl \

Definition of tetartohedral 

of a crystal

: having one fourth the number of planes required by complete symmetry — compare hemihedral, holohedral

First Known Use of tetartohedral

circa 1858, in the meaning defined above

History and Etymology for tetartohedral

Greek tetartos fourth; akin to Greek tettares four — more at four

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The first known use of tetartohedral was circa 1858

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