Medical Definition of mouse
plural mice \ˈmīs\play
1: any of numerous small rodents with pointed snout, rather small ears, elongated body, and slender hairless or sparsely haired tail, including all the smaller members of the genus Mus (as the medically significant house mouse, M. musculus) and many members of other rodent genera and families having little more in common than their relatively small size
2: a dark-colored swelling caused by a blow; specifically : black eye
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