mutant

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An organism, cell, virus, or gene resulting from genetic mutation.
• noun Slang One that is suggestive of a genetic mutant, as in bizarre appearance or inaptitude.
• adjective Resulting from genetic mutation.
• adjective Slang Suggestive of a genetic mutant.

from The Century Dictionary.

• In entomology, said of a perpendicular part the apex of which bends over.
• Of, pertaining to, or by means of mutation.
• noun In biology, a race or an individual organism that has arisen through mutation. See mutation, 8.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Something which has mutated, which has one or more new characteristics from a mutation.
• noun informal Someone or something that seems strange, abnormal, or bizarre.
• adjective That has undergone mutation.
• adjective informal Strange, abnormal, or bizarre.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an animal that has undergone mutation
• adjective tending to undergo or resulting from mutation
• noun (biology) an organism that has characteristics resulting from chromosomal alteration