Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A double eight-sided pyramid, a form common with tetragonal crystals; — so called because this form often occurs in crystals of zircon.

from the GNU version of the Collaborative International Dictionary of English

  • n. A double eight-sided pyramid, a form common with tetragonal crystals; -- so called because this form often occurs in crystals of zircon.

from The Century Dictionary and Cyclopedia

  • n. In crystallography, a double eight-sided pyramid belonging to the tetragonal system: so called because it is a common form with zircon.

Etymologies

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