- a combining form meaning “the earth,” used in the formation of compound words: geochemistry.
Origin of geo-
< Greek geō-, combining form of gê the earth
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- indicating earthgeomorphology
from Greek, from gē 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).
Online Etymology Dictionary, © 2010 Douglas Harper
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- A prefix that means earth, as in geochemistry, the study of the Earth's chemistry.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.