mutant

Short definition from Wiktionary

Noun

1. 1
   That which has mutated, with one or more new characteristics from a mutation.
2. 2
   Someone or something that seems strange, abnormal, or bizarre.
3. 3
   Synonym of mutex.

Adjective

1. 1
   Of, relating to, undergoing (i.e. mutating), or resulting from change or mutation; that has undergone mutation.
2. 2
   Strange, abnormal, or bizarre.