house mouse

WordReference Random House Unabridged Dictionary of American English © 2025

house′ mouse′, 

1. Mammals a brownish-gray Old World mouse, Mus musculus, now common in the U.S. in or near houses. See illus. under mouse. 

• 1825–35

Collins Concise English Dictionary © HarperCollins Publishers::

house mouse noun

1. any of various greyish mice of the Old World genus Mus, esp M. musculus, a common household pest in most parts of the world: family Muridae