Definition of brown rat
: a common domestic rat (Rattus norvegicus) that has been introduced worldwide — called also
Norway rat
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Recent Examples of brown rat from the Web
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Black rats weigh in at 41/2 ounces and grow up to 5 to 6 inches long; adult brown rats weigh 9 to 10 ounces and reach up to 16 inches.
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In our study, the commonest wild animal detected in New York City waters was the brown rat, a common urban denizen.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'brown rat.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of brown rat
1737
Medical Dictionary
brown rat
medical Definition of brown rat
: a common domestic rat of the genus Rattus (R. norvegicus) that has been introduced worldwide — called also
Norway rat
Learn More about brown rat
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See words that rhyme with brown rat Britannica.com: Encyclopedia article about brown rat
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