Gnawing; biting; corroding; (Med.) applied to a destructive variety of cancer or ulcer.

a rat, or mouse.

Any of a large number of small growing mammals having a single pair of continuously gnawing sharp chisel-like upper teeth. The rodent family includes squirrels, gophers, mice, rats, beavers, and porcupines.

Any of a large group of small gnawing mammals (gophers, voles, and mice).