v. de·te·ri·o·rat·ed, de·te·ri·o·rat·ing, de·te·ri·o·rates
To diminish or impair in quality, character, or value: Time and neglect had deteriorated the property.
1. To grow worse; degenerate: The weather deteriorated overnight.
2. To weaken or disintegrate; decay: The nation's highways are deteriorating at a rapid pace.
[Late Latin dēteriōrāre, dēteriōrāt-, from Latin dēterior, worse; see de- in the Appendix of Indo-European roots.]
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.