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Rodentia 啮齿目 啮齿目 Rodentia n 1: small gnawing animals: porcupines; rats; mice; squirrels; marmots; beavers; gophers; voles; hamsters; guinea pigs; agoutis [ synonym: { Rodentia}, { order Rodentia}] Rodentia \ Ro* den" ti* a\, n. pl. [ NL. See { Rodent}, a.] ( Zool.) 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. [ 1913 Webster] Note: The incisor teeth are long, curved, and strongly enameled on the outside, so as to keep a cutting edge. They have a persistent pulp and grow continuously. [ 1913 Webster]
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