ge·o·fact 
(jēō-făkt′)
(jēō-făkt′)n.
A natural rock fragment having the appearance of an artifact made by humans.
[From GEO-, on the model of ARTIFACT.]
- extensiveness
- extensometer
- extensor
- extent
- extenuate
- extenuation
- extenuative
- extenuator
- extenuatory
- exterior
- exterior angle
- exteriority
- exteriorize
- exteriorly
- exterminate
- extermination
- exterminative
- exterminator
- exterminatory
- extern
- external
- external auditory canal
- external capsule
- external-combustion engine
- external ear