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See more synonyms for magnetosheath on Thesaurus.com
noun Astronomy.
  1. the region between the magnetopause of the earth or of some other planet and the shock front caused by the solar wind.
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Origin of magnetosheath

First recorded in 1965–70; magneto- + sheath
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018