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[2x]
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mutagen
CIDE DICTIONARY
mutagen, n.
A chemical compound or other external influence (such as ionizing radiation) which causes mutations{3}. [PJC]
OXFORD DICTIONARY
mutagen, n. an agent promoting mutation, e.g. radiation.
Derivative
mutagenic adj. mutagenesis n.
Etymology
MUTATION + -GEN
For further exploring for "mutagen" in Webster Dictionary Online