One that tones, as:
a. A chemical bath used to change the color of a photographic print or to preserve black-and-white prints or movie film.
b. A powdery ink used dry or suspended in a liquid to produce a document by means of a photocopier or laser printer.
c. A lotion used to refresh the skin.
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.