1. An organism, cell, virus, or gene resulting from genetic mutation.
2. Slang One that is suggestive of a genetic mutant, as in bizarre appearance or inaptitude.
1. Resulting from genetic mutation: a mutant strain of bacteria.
2. Slang Suggestive of a genetic mutant.
[Latin mūtāns, mūtant-, present participle of mūtāre, to change; see MUTATE.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.