Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An asymmetrical region surrounding the earth, extending from about one hundred to several thousand kilometers above the surface, in which charged particles are trapped and their behavior is dominated by the earth's magnetic field.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The comet-shaped region around Earth or another planet in which charged particles are trapped or deflected. Shaped by the solar wind and the planet's magnetic field.

from the GNU version of the Collaborative International Dictionary of English

  • n. the magnetic field of a planet; the volume around the planet in which charged particles are subject more to the planet's magnetic field than to the solar magnetic field.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the magnetic field of a planet; the volume around the planet in which charged particles are subject more to the planet's magnetic field than to the solar magnetic field

Etymologies

magneto- + -sphere (Wiktionary)

Examples

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