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  1. an animal that catches mice: Our cat is a good mouser.
  2. a person or thing that seeks or prowls, as if for prey.

Origin of mouser

Middle English word dating back to 1350–1400; see origin at mouse, -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for mouser

Historical Examples

  • Now "Mouser" was Farmer Green's big, yellow-eyed, black cat!

    Grasshopper Green and the Meadow Mice

    John Rae

  • “And Mouser likes her, too,” said Lorischen, as if that settled the matter.

    Fritz and Eric

    John Conroy Hutcheson

  • Gentle as a lamb—soft as butter—kind as cream—and such a mouser!

    Eugene Aram, Complete

    Edward Bulwer-Lytton

  • Are you sure it will be as good a mouser and as sweet-tempered and as pretty?

  • Mouser had it straight when he talked about hearing ghosts walking.

British Dictionary definitions for mouser


  1. a cat or other animal that is used to catch mice: usually qualifieda good mouser
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for mouser


"cat that hunts mice," c.1400, agent noun from mouse (v.).

Online Etymology Dictionary, © 2010 Douglas Harper