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Meaning of neutrosphere

neu•tro•sphere

Pronunciation: (n'tru-sfēr", ny'-), [key]
— n.
  1. the part of the atmosphere whose constituents are, for the most part, electrically neutral, extending from the earth's surface to the base of the ionosphere.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.