brown rat

noun

Definition of brown rat

: a common domestic rat (Rattus norvegicus) that has been introduced worldwide

— called also Norway rat

Recent Examples on the Web

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. — Kym Pokorny, OregonLive.com, "'It's a bad year for rats' in Oregon cities: Here's how to fight them," 13 Feb. 2018 In our study, the commonest wild animal detected in New York City waters was the brown rat, a common urban denizen. — Mark Stoeckle, Smithsonian, "Scientists Can Tell What Fish Live Where Based On DNA in the Water," 13 Apr. 2017

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More Definitions for brown rat

brown rat

noun

: a common domestic rat of the genus Rattus (R. norvegicus) that has been introduced worldwide

— called also Norway rat