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brown rat Syllabification: brown rat

Definition of brown rat in English:


A rat found throughout the world, often living in association with man and regarded as a pest. It is commonly kept as a laboratory animal and as a pet, and is also bred in the albino form. Also called common rat, Norway rat.
  • Rattus norvegicus, family Muridae
Example sentences
  • Only three out of twenty-seven species of mammals in Kuwait are not endangered, and they are the house rat, brown rat, and house mouse.
  • Many people mistake the endangered water vole for the brown rat and accidentally poison them or disturb their burrows.
  • Originating in Asia and arriving in North America about 1775, the brown rat is humanity's worst animal pest.

Definition of brown rat in:

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