Mouser definitions

mou'zər, -sər
An animal, especially a cat, that catches mice.
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A cat, dog, etc., with reference to its ability to catch mice.

Some breeds of terrier are excellent mousers.

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A cat that catches mice, kept specifically for the purpose.
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(chiefly Scotland, US) A moustache.
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Origin of mouser

From mouse +"Ž -er.