RODENTIA
Rodentia, order Rodentia
(noun) small gnawing animals: porcupines; rats; mice; squirrels; marmots; beavers; gophers; voles; hamsters; guinea pigs; agoutis
Source: WordNet® 3.1
Ro*den"ti*a, n. pl. Etym: [NL. See Rodent, a.] (Zoöl.)
Definition: 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.
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.
Source: Webster’s Unabridged Dictionary 1913 Edition