Definition of "mouser" [mous•er]

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

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Well, he's a "mouser," or one of a group of hobbiests who explore old caves, sewer systems, etc."
• ""mouser," a slang term for a group of risk-takers who explore caves, tunnels and sewer systems."
• "He's a pussycat reallyLarry, the Downing Street catTragically, endearingly, endearingly tragically or possibly tragically endearingly, news reaches us that No 10 has been furnished with a mouser from Battersea Cats' Home, to try to deal with its vermin problem insert own joke here."