pyritohedron

noun
py·ri·to·he·dron | \-drən sometimes -ˌdrän\
plural pyritohedrons or pyritohedra

Definition of pyritohedron 

: a pentagonal dodecahedron that is a hemihedral form of the isometric system of crystalline symmetry common to pyrite

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History and Etymology for pyritohedron

New Latin, from pyrito- (from International Scientific Vocabulary pyrite) + -hedron

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