house mouse

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A common mouse (Mus musculus) that lives in or near buildings, can be an agricultural pest and carrier of disease, and is bred in numerous strains for use as a laboratory animal.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The universally common mouse of the species Mus musculus.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun brownish-grey Old World mouse now a common household pest worldwide