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English definition of “mutant”

mutant

noun [C] uk   /ˈmjuː.tənt/ us    /-t̬ənt/
an organism that is different from others of its type because of a permanent change in its genes: These mutants lack a vital protein which gives them immunity to the disease. This mutant gene is thought to cause cancer.figurative humorous I'm convinced he's a mutant - he's not a bit like the rest of our family!GeneticsInnate and congenital disapproving an unpleasant and frightening thing: The result of these experiments will be a nightmarish world filled with two-headed monsters and other mutants.Strange, suspicious and unnatural things and people
(Definition of mutant from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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