OXFORD DICTIONARY
rodent, n. & adj.
--n. any mammal of the order Rodentia with strong incisors and no canine teeth, e.g. rat, mouse, squirrel, beaver, porcupine.
--adj.
1 of the order Rodentia.
2 gnawing (esp. Med. of slow-growing ulcers).
rodent officer Brit. an official dealing with rodent pests.
rodential adj.
L rodere ros- gnaw
THESAURUS
rodent
amphibian, aquatic, biped, canine, cannibal, carnivore, cosmopolite, feline, gnawer, herbivore, insectivore, invertebrate, mammal, mammalian, marsupial, marsupialian, mouselike, mousy, omnivore, primate, quadruped, ratty, reptile, rodential, ruminant, scavenger, ungulate, varmint, vermin, verminous, vertebrate