noun,plural ped·i·a [ped-ee-uh, pee-dee-uh]. /ˈpɛd i ə, ˈpi di ə/. Crystallography.
a crystal form having only a single face, without a symmetrical equivalent: unique to the triclinic system.
1885–90; <New Latin <Greek pedíon plain, level ground, diminutive of pédon ground, earth
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