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pedion

[ped-ee-uh n, pee-dee-] /ˈpɛd i ən, ˈpi di-/
noun, plural pedia
[ped-ee-uh, pee-dee-uh] /ˈpɛd i ə, ˈpi di ə/ (Show IPA).
Crystallography
1.
a crystal form having only a single face, without a symmetrical equivalent: unique to the triclinic system.
Origin
1885-1890
1885-90; < Neo-Latin < Greek pedíon plain, level ground, diminutive of pédon ground, earth
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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