en·vi·ron·men·tal (ĕn-vī′rən-mĕntl, -vī′ərn-)
1. Relating to or associated with the environment.
2. Relating to or concerned with the impact of human activities on the natural environment: the environmental movement.
3. Relating to potentially harmful factors originating in the environment: environmental illness.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 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.