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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
hypercapnia is a noun meaning "the physical condition of having the presence of an abnormally high level of carbon dioxide in the circulating blood". It carries one recorded sense.
the physical condition of having the presence of an abnormally high level of carbon dioxide in the circulating blood
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for hypercapnia come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.