Geo is defined as related to the Earth.
(prefix)An example of geo is geophone which is a device that detects seismic activity beneath the earth's surface.
See geo- in Webster's New World College Dictionary
Origin: Gr geō- < gaia, gē, the earth
See geo- in American Heritage Dictionary 4
or ge-
prefixOrigin:
Origin: Greek geō-
Origin: , from gē, earth
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