A rodent is a small furry mammal whose teeth never stop growing. The rodent species includes mice, rats, squirrels, beaver, and many more.

Mice are known for their shyness, and lemmings are tragically famous for their supposed mass suicides when their populations exceed food supplies, but when you call someone a rodent, it's an insult. It's akin to calling them a rat. You're suggesting they eat garbage, live in sewers and stand for all that is dirty and vile.

Definitions of rodent
  1. noun
    relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing
    synonyms: gnawer
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    any of numerous small rodents typically resembling diminutive rats having pointed snouts and small ears on elongated bodies with slender usually hairless tails
    any of various long-tailed rodents similar to but larger than a mouse
    a rodent that is a member of the family Muridae
    water rat
    any of various amphibious rats
    New World mouse
    a variety of rodent
    Ondatra zibethica, muskrat, musquash
    beaver-like aquatic rodent of North America with dark glossy brown fur
    Florida water rat, Neofiber alleni, round-tailed muskrat
    of Florida wetlands
    Sigmodon hispidus, cotton rat
    destructive long-haired burrowing rat of southern North America and Central America
    wood rat, wood-rat
    any of various small short-tailed rodents of the northern hemisphere having soft fur grey above and white below with furred tails and large ears; some are hosts for Ixodes pacificus and Ixodes scapularis (Lyme disease ticks)
    short-tailed Old World burrowing rodent with large cheek pouches
    gerbil, gerbille
    small Old World burrowing desert rodent with long soft pale fur and hind legs adapted for leaping
    any of various short-tailed furry-footed rodents of circumpolar distribution
    hedgehog, porcupine
    relatively large rodents with sharp erectile bristles mingled with the fur
    jumping mouse
    any of several primitive mouselike rodents with long hind legs and no cheek pouches; of woodlands of Eurasia and North America
    mouselike jumping rodent
    small furry-tailed squirrel-like Old World rodent that becomes torpid in cold weather
    a kind of arboreal rodent having a long bushy tail
    prairie dog, prairie marmot
    any of several rodents of North American prairies living in large complex burrows having a barking cry
    stocky coarse-furred burrowing rodent with a short bushy tail found throughout the northern hemisphere; hibernates in winter
    large semiaquatic rodent with webbed hind feet and a broad flat tail; construct complex dams and underwater lodges
    Aplodontia rufa, mountain beaver, sewellel
    bulky nocturnal burrowing rodent of uplands of the Pacific coast of North America; the most primitive living rodent
    short-tailed rough-haired South American rodent
    Dolichotis patagonum, mara
    hare-like rodent of the pampas of Argentina
    Hydrochoerus hydrochaeris, capibara, capybara
    pig-sized tailless South American amphibious rodent with partly webbed feet; largest living rodent
    Dasyprocta aguti, agouti
    agile long-legged rabbit-sized rodent of Central America and South America and the West Indies; valued as food
    Cuniculus paca, paca
    large burrowing rodent of South America and Central America; highly esteemed as food
    mountain paca
    rodent of mountains of western South America
    Myocastor coypus, coypu, nutria
    aquatic South American rodent resembling a small beaver; bred for its fur
    Chinchilla laniger, chinchilla
    small rodent with soft pearly grey fur; native to the Andes but bred in captivity for fur
    mountain chinchilla, mountain viscacha
    a rodent native to the mountains of Chile and Peru and now bred in captivity
    Lagostomus maximus, chinchillon, viscacha
    gregarious burrowing rodent larger than the chinchillas
    abrocome, chinchilla rat, rat chinchilla
    ratlike rodent with soft fur and large ears of the Andes
    mole rat
    furry short-limbed tailless rodent resembling a true mole in habits and appearance; of eastern Europe and Middle East
    mole rat
    African rodent resembling a mole in habits and appearance
    sand rat
    small nearly naked African mole rat of desert areas
    pocket rat
    any of various rodents with cheek pouches
    Mus musculus, house mouse
    brownish-grey Old World mouse now a common household pest worldwide
    Micromyx minutus, harvest mouse
    small reddish-brown Eurasian mouse inhabiting e.g. cornfields
    field mouse, fieldmouse
    any nocturnal Old World mouse of the genus Apodemus inhabiting woods and fields and gardens
    nude mouse
    a mouse with a genetic defect that prevents them from growing hair and also prevents them from immunologically rejecting human cells and tissues; widely used in preclinical trials
    Norway rat, Rattus norvegicus, brown rat
    common domestic rat; serious pest worldwide
    Rattus rattus, black rat, roof rat
    common household pest originally from Asia that has spread worldwide
    bandicoot rat, mole rat
    burrowing scaly-tailed rat of India and Ceylon
    jerboa rat
    large Australian rat with hind legs adapted for leaping
    beaver rat
    amphibious rat of Australia and New Guinea
    American harvest mouse, harvest mouse
    any of several small greyish New World mice inhabiting e.g. grain fields
    wood mouse
    any of various New World woodland mice
    dusky-footed wood rat
    a wood rat with dusky feet
    field mouse, vole
    any of various small mouselike rodents of the family Cricetidae (especially of genus Microtus) having a stout short-tailed body and inconspicuous ears and inhabiting fields or meadows
    Neotoma cinerea, bushytail woodrat, pack rat, packrat, trade rat
    any of several bushy-tailed rodents of the genus Neotoma of western North America; hoards food and other objects
    Neotoma floridana, eastern woodrat
    large greyish-brown wood rat of the southeastern United States
    Oryzomys palustris, rice rat
    hardy agile rat of grassy marshes of Mexico and the southeastern United States
    Cricetus cricetus, Eurasian hamster
    a variety of hamster common to Europe and Asia
    Mesocricetus auratus, Syrian hamster, golden hamster
    small light-colored hamster often kept as a pet
    gerbil of northern Africa
    Meriones unguiculatus, tamarisk gerbil
    a gerbil that is popular as a pet
    Meriones longifrons, sand rat
    southern European gerbil
    European lemming, Lemmus lemmus
    notable for mass migrations even into the sea where many drown
    Lemmus trimucronatus, brown lemming
    of northwestern Canada and Alaska
    gray lemming, grey lemming, red-backed lemming
    Old World lemming
    pied lemming
    North American lemming having a white winter coat and some claws much enlarged
    Synaptomys cooperi, southern bog lemming
    of low bogs and meadows of northeastern and central United States and southern Canada
    Synaptomys borealis, northern bog lemming
    of wet alpine and subalpine meadows of Canada and Alaska
    Old World porcupine
    terrestrial porcupine
    New World porcupine
    arboreal porcupine
    Zapus hudsonius, meadow jumping mouse
    widely distributed in northeastern and central United States and Canada
    typical jerboa
    small nocturnal jumping rodent with long hind legs; of arid parts of Asia and northern Africa
    Jaculus jaculus
    a variety of jerboa
    Glis glis, loir
    large European dormouse
    Muscardinus avellanarius, hazel mouse
    a variety of dormouse
    dormouse of southern Europe and northern Africa
    tree squirrel
    any typical arboreal squirrel
    gopher, ground squirrel, spermophile
    any of various terrestrial burrowing rodents of Old and New Worlds; often destroy crops
    Cynomys ludovicianus, blacktail prairie dog
    tail is black tipped
    Cynomys gunnisoni, whitetail prairie dog
    tail is white tipped
    Tamias striatus, eastern chipmunk, ground squirrel, hackee, striped squirrel
    small striped semiterrestrial eastern American squirrel with cheek pouches
    a burrowing ground squirrel of western America and Asia; has cheek pouches and a light and dark stripe running down the body
    Eutamius asiaticus, Eutamius sibiricus, baranduki, baronduki, barunduki, burunduki
    terrestrial Siberian squirrel
    American flying squirrel
    New World flying squirrels
    Marmota monax, groundhog, woodchuck
    reddish brown North American marmot
    Marmota caligata, hoary marmot, whistler, whistling marmot
    large North American mountain marmot
    Marmota flaviventris, rockchuck, yellowbelly marmot
    heavy-bodied yellowish-brown marmot of rocky areas of western North America
    Asiatic flying squirrel
    nocturnal rodent of Asia having furry folds of skin between forelegs and hind legs enabling it to move by gliding leaps
    Castor fiber, Old World beaver
    a European variety of beaver
    Castor canadensis, New World beaver
    a variety of beaver found in almost all areas of North America except Florida
    Cavia cobaya, guinea pig
    stout-bodied nearly tailless domesticated cavy; often kept as a pet and widely used in research
    Cavia porcellus, aperea, wild cavy
    South American cavy; possibly ancestral to the domestic guinea pig
    type of:
    eutherian, eutherian mammal, placental, placental mammal
    mammals having a placenta; all mammals except monotremes and marsupials
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