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Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
marsupium is a noun meaning "an external abdominal pouch in most marsupials where newborn offspring are suckled". It carries one recorded sense.
an external abdominal pouch in most marsupials where newborn offspring are suckled
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 marsupium come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.