The definition of rodent is something gnawing, or something related to a small mammal with constantly growing incisor teeth used for gnawing.
A trap intended to capture a mouse or a rat is an example of a rodent trap.
Rodent is defined as a small mammal that has a pair of incisor teeth that are constantly growing and that are used for gnawing.
A rat is an example of a rodent.
rodent definition by Webster's New World
of or like a rodent or rodents
Origin: Classical Latin rodens, present participle of rodere, to gnaw: see rat
any of a very large order (Rodentia) of gnawing mammals, including rats, mice, squirrels, and beavers, characterized by constantly growing incisors adapted for gnawing or nibbling; esp., in popular usage, a rat or mouse
Any of various very numerous, mostly small mammals of the order Rodentia, having large front teeth used for gnawing. The teeth grow throughout the animal's life, and are kept from getting too long by gnawing. Rodents make up about half the living species of mammals, and include rats, mice, beavers, squirrels, lemmings, shrews, and hamsters.