belonging or pertaining to the gnawing or nibbling mammals of the order Rodentia, including the mice, squirrels, beavers, etc.
a rodent mammal.

1825–35; < Neo-Latin Rodentia Rodentia

rodentlike, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rodent (ˈrəʊdənt)
a.  any of the relatively small placental mammals that constitute the order Rodentia, having constantly growing incisor teeth specialized for gnawing. The group includes porcupines, rats, mice, squirrels, marmots, etc
 b.  (as modifier): rodent characteristics
[C19: from Latin rōdere to gnaw, corrode]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1835, from Mod.L. rodentia, the order name, from L. rodentem (nom. rodens), prp. of rodere "to gnaw, eat away," from PIE base *red- "to scrape, scratch, gnaw" (cf. Skt. radati "scrapes, gnaws," radanah "tooth;" L. radere "to scrape;" Welsh rhathu "scrape, polish"). Uncertain connection to O.E. rætt
(see rat).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
rodent   (rōd'nt)  Pronunciation Key 
Any of various very numerous, mostly small mammals of the order Rodentia, having large front teeth used for gnawing. The teeth grow throughout the animal's life, and are kept from getting too long by gnawing. Rodents make up about half the living species of mammals, and include rats, mice, beavers, squirrels, lemmings, shrews, and hamsters.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
She built on that research by testing the prediction in rodents.
The eyes of moles and of some burrowing rodents are rudimentary in size, and in
  some cases are quite covered by skin and fur.
Portraits of the buck-toothed, retiring rodents are everywhere at the show.
The subjects in these drawings are usually rodents and birds.
Images for rodents
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