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English definition of “carcinogen”

carcinogen

noun [C]     /kɑːˈsɪn.ə.dʒən/ US  /kɑːr-/
a substance that causes cancer: The American government classifies both asbestos and environmental tobacco smoke as class one carcinogens.Cancer
(Definition of carcinogen noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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