Definitions

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

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. 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.

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

Etymologies

New Latin, from Latin acapnos, without smoke (which contains carbon dioxide), from Greek akapnos : a-, not; see a-1 + kapnos, smoke.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From New Latin, from Latin acapnos ("without smoke"), from Ancient Greek ἄκαπνος (akapnos, "without smoke"), from ἀ- (a-, "not") + καπνός (kapnos, "smoke"). (Wiktionary)

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