Definitions

from The Century Dictionary.

  • noun A form, belonging to the asymmetric or pediad class of the triclinic system, consisting of a single face only.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun crystallography An asymmetric triclinic crystal form that only has one face.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek πεδίον ("plain, field").

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