ratter definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- a dog or cat skilled at catching rats
- Slang a betrayer or informer
ratter definition by American Heritage Dictionary
- One that catches or kills rats: Many terriers are good ratters.
- Slang One who betrays or deserts another.