v. e·rod·ed, e·rod·ing, e·rodes
1. To wear (something) away by erosion: Waves eroded the shore.
2. To eat into or eat away the substance of: Acidic water erodes pipes. Arthritis had eroded the cartilage.
3. To make or form by wearing away: The river eroded a deep valley.
4. To cause to diminish or deteriorate: "Long enduring peace often erodes popular resolution" (C.L. Sulzberger).
1. To become worn or eaten away: The cliffs have eroded over the centuries.
2. To diminish or deteriorate: Public confidence in the administration eroded.
[Latin ērōdere, to gnaw off, eat away : ē-, ex-, ex- + rōdere, to gnaw; see rēd- 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.