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Synonyms

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.

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

From Barron's • Feb. 15, 2026

Larry the cat already serves as 10 Downing Street's chief mouser but there are no plans to introduce pets to tackle the pest problem in the Palace of Westminster down the road.

From BBC • Jun. 18, 2025

A number of you also have had the great joy of having the greatest cat ever and the greatest mouser ever.

From Seattle Times • Mar. 3, 2023

He also developed an antagonistic relationship with the Foreign Office’s own mouser, Palmerston, who has since retired from public duty.

From New York Times • Sep. 6, 2022

Her name wasn’t a compliment so much as a joke; as a mouser, she was a calamity.

From "Bone Gap" by Laura Ruby

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.