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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.
allotropy is a noun meaning "the phenomenon of an element existing in two or more physical forms". It carries one recorded sense.
the phenomenon of an element existing in two or more physical forms
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 allotropy come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.