/ Dictionary / Index R rat terrier: Meaning and Definition of Find definitions for: rat' ter"rier Pronunciation: [key] a terrier of any of several breeds developed esp. for catching rats, as the Manchester terrier. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ratter Rattigan Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language