a. Capable of or subject to change or alteration.
b. Prone to frequent change; inconstant: mutable weather patterns.
2. Tending to undergo genetic mutation: a mutable organism; a mutable gene.
[Middle English, from Latin mūtābilis, from mūtāre, to change; see MUTATE.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. 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.