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geo-
geoarchaeology
geobotany
geocentric
geochemistry
geochronology
geochronometry
geocorona
geode
geodesic
geodesic dome
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geode

ge·ode [ jd ] (plural ge·odes)


noun 
Definition:
 
1. hollow rock with crystals: a roughly spherical rock mass containing a cavity lined or filled with crystals that have grown unimpeded and so are frequently perfectly formed

2. cavity in hollow rock: the crystal-lined cavity within a geode

[Late 17th century. Via Latin geodes< Greek geōdēs "earthy" < "Earth"]
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