from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A region of the atmosphere lying mostly in the stratosphere, between about 15 and 30 kilometers (10 and 20 miles) in altitude, containing a relatively high concentration of ozone that absorbs solar ultraviolet radiation in a wavelength range not screened by other atmospheric components.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
regionof the stratosphere, between 15 and 30 kilometresin altitude, containing a relatively high concentrationof ozone; it absorbsmost solar ultraviolet radiation
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun
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