tr.v. de·con·tam·i·nat·ed, de·con·tam·i·nat·ing, de·con·tam·i·nates
1. To eliminate contamination in.
2. To make safe by eliminating poisonous or otherwise harmful substances or agents, such as noxious chemicals, radioactive material, or microorganisms.
de′con·tami·nant (-nənt) n.
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.