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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.
hemiacetal is a noun meaning "an organic compound usually formed as an intermediate product in the preparation of acetals from aldehydes or ketones". It carries one recorded sense.
an organic compound usually formed as an intermediate product in the preparation of acetals from aldehydes or ketones
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 hemiacetal come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.