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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.
mesoderm is a noun meaning "the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue". It carries one recorded sense.
the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue
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 mesoderm come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.