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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.
poliomyelitis is a noun meaning "an acute viral disease marked by inflammation of nerve cells of the brain stem and spinal cord". It carries one recorded sense.
an acute viral disease marked by inflammation of nerve cells of the brain stem and spinal cord
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 poliomyelitis come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.