Usually means: Earth's magnetic field generated internally.
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We found 4 dictionaries that define the word geodynamo:

General (2 matching dictionaries)
  1. geodynamo: Wiktionary
  2. Geodynamo: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. geodynamo: Encyclopedia

Science (1 matching dictionary)
  1. Geodynamo: Eric Weisstein's World of Astronomy

Definitions from Wiktionary (geodynamo)

noun:  the mechanism responsible for the generation of the Earth's magnetic field caused by convection and conduction currents in the fluid core

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