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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.
polydactyly is a noun meaning "birth defect characterized by the presence of more than the normal number of fingers or toes". It carries one recorded sense.
birth defect characterized by the presence of more than the normal number of fingers or toes
homo
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 polydactyly come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.