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mouser

American  
[mou-zer] / ˈmaʊ zər /

noun

  1. an animal that catches mice: mouse.

    Our cat is a good mouser.

  2. a person or thing that seeks or prowls, as if for prey.

mouser British  
/ ˈmaʊsə, ˈmaʊzə /

noun

  1. a cat or other animal that is used to catch mice: usually qualified

    a 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

Etymology

Origin of mouser

Middle English word dating back to 1350–1400; mouse, -er 1

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The UK's most famous feline, Larry the cat, marks 15 years as the country's chief mouser patrolling the corridors of power of 10 Downing Street.

From Barron's • Feb. 15, 2026

But it was the overwhelming reaction to Erik’s accompanying Backstory, on the loss of his beloved mouser cat, Charlie, that registered in our hearts as well as in our analytics.

From Seattle Times • Mar. 5, 2023

In subsequent years, he was given the exalted title of chief mouser to the Cabinet Office, a post he has carried out with mixed results, depending on who is passing judgment.

From New York Times • Sep. 6, 2022

While many rushed forward to introduce their pets, other political feline counterparts also came forward, including chief mouser Larry, of 10 Downing Street fame in the UK.

From BBC • Oct. 26, 2017

That new electronic mouser that made a noise only mice could hear and sent them screaming into the night?

From "Ralph S. Mouse" by Beverly Cleary

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.