MUTANT

[noun] [C]A mutant is an organism that is different from others of its type because of a permanent change in its genes.These mutants lacked a vital block of genetic instructions giving them immunity to the disease.The sweet lime is possibly a natural mutant of lemon.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!(disapproving) Mutants are sometimes thought of as unpleasant and frightening.The result of these experiments will be a nightmarish world filled with two-headed monsters and other mutants.