acapnia acanthus • acapnial · · · Info · Definitions · Synonyms · Characters · · acapnia · · Text Latin · · Script 7 · · Length Definitions · · · (noun) a state in which the level of carbon dioxide in the blood is lower than normal; can result from deep or rapid breathing. Synonyms: hypocapnia. · · Noun Definition 1 Synonyms · · · hypocapnia · · Synonym 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 i latin small letter i U+0069 n latin small letter n U+006E p latin small letter p U+0070