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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.

On Saturday came sad news that Palmerston, a black-and-white cat, once mouser to the Foreign Office and "Diplocat extraordinaire", had passed away in Bermuda where he retired in 2020.

From Barron's • Feb. 15, 2026

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

But the chief mouser is likely to be more interested in the ongoing turf war between him and his Foreign Office rival, Palmerston.

From BBC • Jul. 24, 2019

“There’s a new electronic mouser on the market,” he volunteered.

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.