/ Dictionary / Index R ratter: Meaning and Definition of Find definitions for: rat•ter Pronunciation: (rat'ur), [key] — n. a person, animal, or thing that catches rats, as a terrier or a cat. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ratter (Thesaurus) ratteen rat terrier Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language