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a combining form meaning “the earth,” used in the formation of compound words:
Origin of geo-
< Greek geō-, combining form of the earth


1. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for geo
  • Maybe even geo nuclear with geothermal and nuclear to give the end boost of power to a geothermal plant.
  • Because it's an extinct geo-political society, there is an added archaeological dimension.
  • Now the age of geopolitics has given way to an age of what be called geo-economics.
  • Alternatively, the high-scorers may simply have relatively fewer interesting things to geo-tag.
  • But part of what keeps people using these geo-services are the incentives systems linked to the products.
  • It would be a geo-strategic error of historic proportions.
  • One wonders whether some informed readers actually feel rather than think their way into geo-politics.
  • Their projects are based on an old geo-political paradigm, instead of a modern geo-economic one.
  • If you're a hip and happening outdoor resort these days, you offer geo-caching.
  • Automated geo graphic awareness makes environmental change as obvious as a slap in the face.
British Dictionary definitions for geo


noun (pl) geos, gios
(esp in Shetland) a small fjord or gully
Word Origin
C18: from Old Norse gjā ravine; related to Old English gionian to yawn


combining form
indicating earth: geomorphology
Word Origin
from Greek, from earth
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 geo


word-forming element meaning "earth," ultimately from Greek geo-, comb. form of ge "earth" (see Gaia).

Online Etymology Dictionary, © 2010 Douglas Harper
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geo in Medicine

geo- or ge-
Earth: geophagia.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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geo in Science
geo- or ge-  
A prefix that means "earth," as in geochemistry, the study of the Earth's chemistry.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Related Abbreviations for geo


  1. genetically engineered organism
  2. geosynchronous earth orbit
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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