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geo-

  1. a combining form meaning “the earth,” used in the formation of compound words: geochemistry.
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Origin of geo-

< Greek geō-, combining form of the earth
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for geo-

geo-

combining form
  1. indicating earthgeomorphology
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Word Origin for geo-

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

Word Origin and History for geo-

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

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Online Etymology Dictionary, © 2010 Douglas Harper

geo- in Medicine

geo-

pref.
  1. Earth:geophagia.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

geo- in Science

geo-

  1. A prefix that means “earth,” as in geochemistry, the study of the Earth's chemistry.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.