a. The act or process of corroding.
b. The condition produced by corroding.
2. A substance, such as rust, formed by corroding.
[Middle English corosioun, corrosion of tissue, from Old French corrosion, from Medieval Latin corrōsiō, corrōsiōn-, the act of gnawing, from Latin corrōsus, past participle of corrōdere, to gnaw away; see CORRODE.]
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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.