2 definitions found From WordNet (r) 2.0 [wn]: gnawer noun: relatively small gnawing animals having a single pair of constantly growing incisor teeth specialized for gnawing [syn: {rodent}, {gnawing animal}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Gnawer \Gnaw"er\, noun 1. One who, or that which, gnaws. 2. (Zo["o]l.) A rodent.

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