Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
cor-rōdo (conr-), si, sum, 3, v. a., to gnaw, gnaw to pieces (very rare): Platonis Politiam (mures), Cic. Div. 2, 27, 59 ter: ossa, * Juv. 15, 80.