brown rat

noun

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

called also Norway rat

Examples of brown rat in a Sentence

Recent Examples on the Web Now researchers are shedding light on why brown rats are the undisputed winners of the real rat race. CBS News, 4 Apr. 2024 Between the species, brown rat bones had a higher delta-N-15 ratio than black rats across sites, suggesting the brown rats were eating more animal protein than their smaller competitors. Lauren Leffer, Popular Science, 3 Apr. 2024 The two most widespread and infamous rat species are the black rat (Rattus rattus) and brown rat (Rattus norvegicus). WIRED, 7 Oct. 2023 The Vancouver Rat Project found that, in a typical day, the city’s brown rats stay within the length of a city block. WIRED, 7 Oct. 2023 To get an idea of the parasite’s whereabouts, scientists studied 33 wild brown rats found dead in an Atlanta zoo between 2019 and 2022. Will Sullivan, Smithsonian Magazine, 29 Sep. 2023 The city’s rat is a Rattus norvegicus, also known as the brown rat, wharf rat, or sewer rat. Madeleine Schwartz, The New York Review of Books, 27 July 2023 Unlike the brown rat, the black rat is known to have carried plague through fleas on its body. Madeleine Schwartz, The New York Review of Books, 27 July 2023 Perhaps in part because of this, brown rats have been found to consistently prefer rewards that benefit others, as opposed to just themselves. Oliver Whang, New York Times, 27 Feb. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'brown rat.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1737, in the meaning defined above

Time Traveler
The first known use of brown rat was in 1737

Dictionary Entries Near brown rat

Cite this Entry

“Brown rat.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/brown%20rat. Accessed 19 Apr. 2024.

Kids Definition

brown rat

noun
: the common rat that is found about human dwellings

Medical Definition

brown rat

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

called also Norway rat

More from Merriam-Webster on brown rat

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