Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An animal, especially a cat, that catches mice.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A cat that catches mice, kept specifically for the purpose.
  • n. A moustache.

from the GNU version of the Collaborative International Dictionary of English

  • n. A cat that catches mice.
  • n. One who pries about on the lookout for something.

from The Century Dictionary and Cyclopedia

  • n. An animal that catches mice: specifically, a cat: commonly used with a qualifying term to describe the proficiency of the animal as a mouse-catcher.

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

  • n. a cat proficient at mousing

Etymologies

From mouse +‎ -er. (Wiktionary)

Examples

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