tr.v. nul·li·fied, nul·li·fy·ing, nul·li·fies
1. To make null; invalidate.
2. To counteract the force or effectiveness of.
[Latin nūllificāre, to despise : nūllus, none; see ne in the Appendix of Indo-European roots + -ficāre, -fy.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 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.