plagiohedral

adjective

pla·​gi·​o·​he·​dral

¦plājēō¦hēdrəl

variants or plagihedral

-jə¦-

: having an oblique spiral arrangement of faces : gyroidal

plagiohedral quartz crystals

specifically : being a group of the isometric system characterized by 13 axes of symmetry but no center or planes

Word History

Etymology

plagi- + -hedral

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