ionosphere Hear it!

ionosphere definition

ion·o·sphere (ī än′ə sfir′)

noun

the outer part of the earth's atmosphere, beginning at an altitude of c. 55 km (c. 34 mi) and extending to the highest parts of the atmosphere: it contains several regions that consist of a series of constantly changing layers characterized by an appreciable electron and ion content

Etymology: < ion + -o- + sphere

Related Forms:

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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