Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “carcinogen”


noun [C]    /kɑrˈsɪn·ə·dʒən/ medical
a substance that can cause cancer (= a serious illness that causes tissues and cells to grow too quickly )
(Definition of carcinogen noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of carcinogen

Definitions of “carcinogen” in other dictionaries

Word of the Day


a good knowledge of something, or the fact that you know it so well

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More