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Norway rat

noun
  1. an Old World rat, Rattus norvegicus, having a grayish-brown body with whitish underparts and a long, scaly tail, now common in the U.S. in or near homes, barns, wharves, etc.
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Origin of Norway rat

First recorded in 1745–55
Also called brown rat.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for norway rat

Norway rat

noun
  1. another name for brown rat
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012