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.
Also called
brown rat
.
Origin
1745-55
British Dictionary definitions for
Norway rat
Norway rat
noun
1.
another name for
brown rat