LATIN DICTIONARYLexicon Latīnum
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“gnaw” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

gnaw
rodere, arrodere, derodere aliquid: circumrodere aliquid (to gnaw round about): praerodere (to gnaw at one end): exedere (to eat away or through; of animals, corroding substances, rust; and figuratively, of cares, anxieties, etc.; edere is poetical in this sense). To gnaw through anything, aliquid exedere et perrumpere: trouble, etc., is gnawing at my heart, aegritudo me or animum meum exest, pungit, or cruciat: gnawing cares, sollicitudines mordaces (Hor., Od. l, 18, 4): a kind of gnawing pain, quasi morsus qs doloris.

Quick answer

What is the Latin word for gnaw?
The usual Latin words for “gnaw” are rōdō, exedō, pungō; also cruciō, careō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.