Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The ultraviolet light emanating from the outermost region of the earth's atmosphere, consisting chiefly of sunlight absorbed and then reemitted from hydrogen atoms.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun The region of
ionized hydrogen that makes up the outermost region of theEarth 'satmosphere . (And by extension of other planets.)
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