Definition of "ratter" [rat•ter]

• One that catches or kills rats: Many terriers are good ratters. (noun)
• Slang One who betrays or deserts another. (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.

• ""ratter" -- superstitious Tudor sailors did not have cats on board as they were thought to bring bad luck."
• "In the Central and South American countries this snake is highly valued as a "ratter" and frequents human habitations without fear."
• "June 26th, 2009 9: 51 pm ET call your senators tell them too vote no on this bill. this bill is bad for the economy raise the price of goods and ship manafactureing job overseas. i can't beleive how every news station is burying it. it seem they forgot howtoo stand up too make this country great, but ratter kiss polical butt"