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pedia

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ped⋅i⋅on

[ped-ee-uhn, pee-dee-]
–noun, plural ped⋅i⋅a [ped-ee-uh, pee-dee-uh] . Crystallography.
a crystal form having only a single face, without a symmetrical equivalent: unique to the triclinic system.

Origin:
1885–90; < NL < Gk pedíon plain, level ground, dim. of pédon ground, earth
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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