Dictionary
Nor'way rat'
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. See illus. under
rat. Also called
brown rat. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.