from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

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

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

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

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

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


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

[French géode, from Latin geōdēs, a precious stone, from Greek, earthlike : , earth + -ōdēs, adj. suff.; see collodion.]


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