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. 这些突变体缺乏一种可以抵抗这种疾病的重要蛋白质。

This mutant gene is thought to cause cancer. 人们认为这种突变基因会致癌。

figurative humorous I'm convinced he's a mutant - he's not at all like the rest of our family! 我觉得他真是个异类——他一点儿也不像我们家的其他人！

an unpleasant and frightening thing

The result of these experiments will be a nightmarish world filled with two-headed monsters and other mutants. 这些实验的结果是一个噩梦般的世界，到处是双头怪和其他可怕的东西。