%rodentia%

‖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 ]

☞ 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 ]