noun
a small mammal characterized by large front teeth for gnawing and a typically long tail
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The scientist conducted a study on the behavior of the rodent species in the laboratory.
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I saw a cute little rodent scurrying around in the park yesterday.
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Watch out for those pesky rodents in the attic, they can cause a lot of damage.
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The politician was compared to a rodent, sneaking around and causing trouble behind the scenes.