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Rat :: Rat (n.) One of several species of small rodents of the genus Mus and allied genera, larger than mice, that infest houses, stores, and ships, especially the Norway, or brown, rat (M. decumanus), the black rat (M. rattus), and the roof rat (M. Alexandrinus). These were introduced into America from the Old World..

Jerboa :: "Jerboa (n.) Any small jumping rodent of the genus Dipus, esp. D. Aegyptius, which is common in Egypt and the adjacent countries. The jerboas have very long hind legs and a long tail..

Agouty :: Agouty (n.) A rodent of the genus Dasyprocta, about the size of a rabbit, peculiar to South America and the West Indies. The most common species is the Dasyprocta agouti..

Aye-aye :: Aye-aye (n.) A singular nocturnal quadruped, allied to the lemurs, found in Madagascar (Cheiromys Madagascariensis), remarkable for its long fingers, sharp nails, and rodent-like incisor teeth..

Rodentia :: Rodentia (a.) An order of mammals having two (rarely four) large incisor teeth in each jaw, distant from the molar teeth. The rats, squirrels, rabbits, marmots, and beavers belong to this order..

Castor :: Castor (n.) A genus of rodents, including the beaver. See Beaver..

Beaver :: Beaver (n.) An amphibious rodent, of the genus Castor..

Corrodent :: Corrodent (n.) Anything that corrodes.

Hystricomorphous :: Hystricomorphous (a.) Like, or allied to, the porcupines; -- said of a group (Hystricomorpha) of rodents..

Tillodontia :: Tillodontia (n. pl.) An extinct group of Mammalia found fossil in the Eocene formation. The species are related to the carnivores, ungulates, and rodents. Called also Tillodonta..

Sciurus :: Sciurus (n.) A genus of rodents comprising the common squirrels.

Muskrat :: Muskrat (n.) A North American aquatic fur-bearing rodent (Fiber zibethicus). It resembles a rat in color and having a long scaly tail, but the tail is compressed, the bind feet are webbed, and the ears are concealed in the fur. It has scent glands which secrete a substance having a strong odor of musk. Called also musquash, musk beaver, and ondatra..

Lissencephala :: Lissencephala (n. pl.) A general name for all those placental mammals that have a brain with few or no cerebral convolutions, as Rodentia, Insectivora, etc..

Scalpriform :: Scalpriform (a.) Shaped like a chisel; as, the scalpriform incisors of rodents..

Lagemorpha :: Lagemorpha (n. pl.) A group of rodents, including the hares. They have four incisors in the upper jaw. Called also Duplicidentata..

Murine :: Murine (n.) One of a tribe of rodents, of which the mouse is the type..

Murine :: Murine (a.) Pertaining to a family of rodents (Muridae), of which the mouse is the type..

Capybara :: Capybara (n.) A large South American rodent (Hydrochaerus capybara) Living on the margins of lakes and rivers. It is the largest extant rodent, being about three feet long, and half that in height. It somewhat resembles the Guinea pig, to which it is related; -- called also cabiai and water hog..

Coypu :: Coypu (n.) A South American rodent (Myopotamus coypus), allied to the beaver. It produces a valuable fur called nutria..

Sigmodont :: Sigmodont (n.) Any one of a tribe (Sigmodontes) of rodents which includes all the indigenous rats and mice of America. So called from the form of the ridges of enamel on the crowns of the worn molars. Also used adjectively.

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