corrosion (n.) Look up corrosion at Dictionary.com
c. 1400, from Middle French corrosion or directly from Latin corrosionem (nominative corrosio), noun of action from past participle stem of corrodere "to gnaw to bits, wear away," from com-, intensive prefix (see com-), + rodere "to gnaw" (possibly from an extended form of PIE root *red- "to scrape, scratch, gnaw").