noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The state in which the level of carbon dioxide in the blood and tissue is significantly lower than normal. uncountable
2. 2
   a state in which the level of carbon dioxide in the blood is lower than normal; can result from deep or rapid breathing wordnet

Synonyms

All synonyms

hypocapniahypocapnia

Antonyms

All antonyms

hypercapnia

Etymology

From New Latin acapnia, from Ancient Greek ἄκαπνος (ákapnos, “without smoke”), from ἀ- (a-, “not”) + καπνός (kapnós, “smoke”).

Related phrases

carbon dioxide

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.