- A geologically occurring slow fission reactor, especially in the Earth's past.
Etymology: From the prefix geo- meaning "Earth", and reactor, a term in nuclear physics
- 2005 February 4, Jessa Forte Netting, "Nature's Nuclear Reactor", Discover Magazine
- : Physicists analyzing a tiny sample of this ancient "discovered in the African country of Gabon in 1972"have now determined how it worked.
- Any man-made industrial structure built into the Earth's crust and operating on the principle of nuclear fission.
- The theorized natural fission reactor at the center of the Earth which would account for the geomagnetic field.
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