Definitions

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 element that concentrates in the atmosphere.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Greek atmos, vapor; see atmosphere + –phile.]

Examples

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