Brown-rat definition

The common domestic rat (Rattus norvegicus), which is found worldwide and is a destructive pest of crops and stored food and a carrier of disease.
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A common, omnivorous large rat (Rattus norvegicus) that swims and dives well, usually lives in underground burrows, and spreads various diseases: the mutant form, a white rat, is used for medical experiments.
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The common domestic rat (Rattus norvegicus), which is found worldwide and is a destructive pest of crops and stored food and a carrier of disease.
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A species of rat, Rattus norvegicus, common worldwide.
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Other Word Forms

Noun

Singular:
brown-rat
Plural:
brown-rats

Brown-rat Sentence Examples

  • The brown rat migrated westwards from Central Asia early in the 18th century, and is believed to have first reached Great Britain about 1730.

  • After this followed the advance of the more powerful brown rat.

  • Foxes are common, both the white and the blue occurring; mice and the brown rat have been introduced, though one variety of mouse is possibly indigenous.

  • The number of rat infestations is reportedly increasing and the brown rat infestations is reportedly increasing and the brown rat is a major problem in urban areas.

  • Selective breeding of the Brown rat has produced the albino laboratory rat.

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