A substance added in small amounts to something else to improve, strengthen, or otherwise alter it.
1. Marked by, produced by, or involving addition.
2. Of or being any of certain primary colors of wavelengths that may be mixed with one another to produce other colors. See Table at color.
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.