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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.
pestilential is an adjective meaning "likely to spread and cause an epidemic disease". It carries one recorded sense.
likely to spread and cause an epidemic disease
“a pestilential malignancy in the air”
“plaguey fevers”
Definitions, synonyms and semantic relations for pestilential come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.