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plasmasphere

American

[plaz-muh-sfeer] / ˈplæz məˌsfɪər /

noun

Astronomy.

a region of cool plasma surrounding the earth, extending 8000–25,000 miles (13,000–40,000 km) into space, and bounded by the plasmapause.

First recorded in 1965–70; plasma + -sphere

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023