7 letters · 11 points in Scrabble
noun a state in which the level of carbon dioxide in the blood is lower than normal; can result from deep or rapid breathing
originFrom New Latin acapnia, from Ancient Greek ἄκαπνος (ákapnos, “without smoke”), from ἀ- (a-, “not”) + καπνός (kapnós, “smoke”).
Etymology from Wiktionary, CC BY-SA 3.0