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rodent (n.)

"a rodent mammal" 1835 (as an adjective 1833), from Modern Latin Rodentia, the order name, from Latin rodentem (nominative rodens), "the gnawers," present participle of rodere "to gnaw, eat away," which is of uncertain etymology, possibly is from an extended form of PIE root *red- "to scrape, scratch, gnaw." Uncertain connection to Old English rætt (see rat (n.)). They are characterized by having no canine teeth and strong incisors.

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Definitions of rodent from WordNet

rodent (n.)
relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing;
Synonyms: gnawer
From wordnet.princeton.edu