from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A chemical element, or a molecule containing that element, that is abundant in gaseous form in the atmosphere of a planet or other solar system body.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun chemistry, geology in the
Goldschmidt classification, a gaseous elementthat concentratesin the atmosphere.
from The American Heritage® Dictionary of the English Language, 4th Edition
[Greek atmos, vapor; see atmosphere + –phile.]
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