Dictionary

magnetosphere

noun mag·ne·to·sphere \mag-ˈnē-tə-ˌsfir, -ˈne-\

Definition of MAGNETOSPHERE

:  a region of space surrounding a celestial object (as a planet or star) that is dominated by the object's magnetic field so that charged particles are trapped in it
mag·ne·to·spher·ic \-ˌnē-tə-ˈsfir-ik, -ˈsfer-\ adjective

First Known Use of MAGNETOSPHERE

1959

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