Definition of rodent
1
: any of an order (Rodentia) of relatively small gnawing mammals (such as a mouse, squirrel, or beaver) that have in both jaws a single pair of incisors with a chisel-shaped edge
2
: a small mammal (such as a rabbit or a shrew) other than a true rodent
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Merriam-Webster unabridged
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Time Traveler for rodent
The first known use of rodent was in 1830
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