Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Having as many planes as required for complete symmetry in a given crystal system.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having as many plane faces as needed for the highest degree of symmetry in its system

from the GNU version of the Collaborative International Dictionary of English

  • adj. Having all the planes required by complete symmetry, -- in opposition to hemihedral.

from The Century Dictionary and Cyclopedia

  • In mineralogy, having all the similar edges or angles similarly replaced, as a crystal.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From holo- + Ancient Greek ἕδρα (hedra, "seat").

Examples

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