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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.
long-chain is an adjective meaning "of molecules having relatively long chains of atoms in a molecule". It carries one recorded sense.
of molecules having relatively long chains of atoms in a molecule
Definitions, synonyms and semantic relations for long-chain come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.