/ Dictionary / Index M magnetosheath: Meaning and Definition of Find definitions for: mag•ne•to•sheath Pronunciation: (mag-nē'tu-shēth"), [key] — n. Astron. the region between the magnetopause of the earth or of some other planet and the shock front caused by the solar wind. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. magnetoresistance magnetosphere Related Content Daily Word Quiz: longevity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language