mutant (n.)youdaoicibaDictYouDict[mutant 词源字典]
1901, in the biological sense, from Latin mutantem (nominative mutans) "changing," present participle of mutare "to change" (see mutable). In the science fiction sense, it is attested from 1954. As an adjective from 1903.[mutant etymology, mutant origin, 英语词源]