georeactor noun3 •A geologically occurring slow fission reactor, especially in the Earth's past.Physicists analyzing a tiny sample of this ancient georeactor—discovered in the African country of Gabon in 1972—have now determined how it worked. — 2005 •The theorized natural fission reactor at the center of the Earth which would account for the geomagnetic field. •Any man-made industrial structure built into the Earth's crust and operating on the principle of nuclear fission. formsgeoreactors
