/ Dictionary / Index R rat guard: Meaning and Definition of Find definitions for: rat' guard" Pronunciation: [key] a disk of sheet metal fitted around a hawser to prevent rats from boarding a vessel moored at a dock. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ratfish Rathbone Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language