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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.
penicillin-resistant is an adjective meaning "unaffected by penicillin". It carries one recorded sense.
unaffected by penicillin
“penicillin-resistant bacteria”
Definitions, synonyms and semantic relations for penicillin-resistant come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.