Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An asymmetric region surrounding a planet, star, or other body, in which the body's magnetic field traps charged particles and dominates their behavior.

from the GNU version of the Collaborative International Dictionary of English.

  • noun 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 Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun physics 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 WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun 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

from Wiktionary, Creative Commons Attribution/Share-Alike License

magneto- + -sphere

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