/ Dictionary / Index R ratsbane: Meaning and Definition of Find definitions for: rats•bane Pronunciation: (rats'bān"), [key] — n. rat poison. the trioxide of arsenic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ratsbane (Thesaurus) rat race rat snake Related Content Daily Word Quiz: designate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language