Cite
 

Dictionary


ex•o•sphere



Pronunciation: (ek'sō-sfēr"), [key]
n.
the highest region of the atmosphere, where the air density is so low that a fast-moving air molecule is more than 50 percent likely to escape from the atmosphere instead of hitting other molecules.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

exosmosisexospore
See also:

 

Related Content