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pedion

[ped-ee-uh n, pee-dee-]
noun, plural ped·i·a [ped-ee-uh, pee-dee-uh] /ˈpɛd i ə, ˈpi di ə/. Crystallography.
  1. a crystal form having only a single face, without a symmetrical equivalent: unique to the triclinic system.
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Origin of pedion

1885–90; < New Latin < Greek pedíon plain, level ground, diminutive of pédon ground, earth
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018