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genus
geo-
geoarchaeology
geobotany
geocentric
geochemistry
geochronology
geochronometry
geocorona
geode
geodesic
geodesic dome
geodesic line
geodesy
geodetic
geodetic survey
geoduck
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geocorona
ge·o·co·ro·na [ j ō kə rṓnə ]


noun 
Definition:
 
outer region of Earth's atmosphere: the outermost region of the Earth's atmosphere, reaching to a height approximately 15 times the radius of the Earth and consisting mainly of hydrogen
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