heterosphere Hear it!

heterosphere definition

hetero·sphere (het′ər ō sfir′)

noun

the upper of two divisions of the earth's atmosphere, above c. 70 km (43 mi), characterized by variation in its component gases

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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