pedion: Meaning and Definition of

ped•i•on

Pronunciation: (ped'ē-un, pē'dē-), [key]
— pl. ped•i•a
  1. a crystal form having only a single face, without a symmetrical equivalent: unique to the triclinic system.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.