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[jee-ohd] /ˈdʒi oʊd/
a hollow concretionary or nodular stone often lined with crystals.
the hollow or cavity of this.
any similar formation.
Origin of geode
1670-80; < French géode < Latin geōdēs < Greek geṓdēs earthlike. See geo-, -ode1
Related forms
[jee-od-ik] /dʒiˈɒd ɪk/ (Show IPA),
[jee-ohd-l] /dʒiˈoʊd l/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for geode
Historical Examples
  • The geode is a spherical and apparently solid stone, but when broken is found to be hollow and coated with crystals.

    The Smoky God Willis George Emerson
  • The geode has a hollow cell within, lined with beautiful crystals of many colors.

  • No date; no place mentioned; we note the suggestion that it was only a geode, which had been upon the ground in the first place.

    The Book of the Damned Charles Fort
  • A geode is a hollow shell of stone, usually quartz, lined with crystals pointing toward the center.

    The Chautauquan, Vol. III, March 1883 The Chautauquan Literary and Scientific Circle
  • geode, an irregular shaped stone, containing a small cavity.

British Dictionary definitions for geode


a cavity, usually lined with crystals, within a rock mass or nodule
Derived Forms
geodic (dʒɪˈɒdɪk) adjective
Word Origin
C17: from Latin geōdēs a precious stone, from Greek: earthlike; see geo-, -ode1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for geode

rounded stone with a hollow center lined with crystals, 1670s, from French géode, from Latin geodes, from Greek geodes "earthy, earth-like," from ge "earth" (Homeric gaia; see Gaia) + -oides, adjective suffix, "characterized by." Perhaps so called in reference to the "earthy" minerals inside.

Online Etymology Dictionary, © 2010 Douglas Harper
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geode in Medicine

geode ge·ode (jē'ōd')
A cystlike space with or without an epithelial lining, usually observed in subarticular bone in arthritic disorders.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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geode in Science
A small, hollow, usually rounded rock lined on the inside with inward-pointing crystals. Geodes form when mineral-rich water entering a cavity in a rock undergoes a sudden change in pressure or temperature, causing crystals to form from the solution and line the cavity's walls.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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