Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A condition marked by an unusually low concentration of carbon dioxide in the blood and tissues.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The state in which the level of carbon dioxide in the blood is lower than normal.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a state in which the level of carbon dioxide in the blood is lower than normal; can result from deep or rapid breathing

Etymologies

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

[New Latin, from Latin acapnus, without smoke (which contains carbon dioxide), from Greek akapnos : a-, not; see a– + kapnos, smoke.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From New Latin, from Latin acapnos ("without smoke"), from Ancient Greek ἄκαπνος (akapnos, "without smoke"), from ἀ- (a-, "not") + καπνός (kapnos, "smoke").

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