Definitions

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

  • n. A hollow, usually spheroidal rock with crystals lining the inside wall.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A nodule of stone having a cavity lined with mineral or crystal matter on the inside wall.

from the GNU version of the Collaborative International Dictionary of English

  • n. A nodule of stone, containing a cavity, lined with crystals or mineral matter.
  • n. The cavity in such a nodule.

from The Century Dictionary and Cyclopedia

  • n. A concretionary stone or pebble, hollow inside, and often having the walls of the cavity lined with crystals.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (mineralogy) a hollow rock or nodule with the cavity usually lined with crystals

Etymologies

French géode, from Latin geōdēs, a precious stone, from Greek, earthlike : , earth + -ōdēs, adj. suff.; see collodion.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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