Definitions

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

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

from The Century Dictionary.

  • noun 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 the GNU version of the Collaborative International Dictionary of English.

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

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

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

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

  • noun a cat proficient at mousing

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From mouse +‎ -er.

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