Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
avirulent is an adjective meaning "not virulent; unable to produce disease". It carries one recorded sense.
not virulent; unable to produce disease
Definitions, synonyms and semantic relations for avirulent come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.