/ Dictionary / Index R raticide: Meaning and Definition of Find definitions for: rat•i•cide Pronunciation: (rat'u-sīd"), [key] — n. a substance or preparation for killing rats. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rathskeller ratification Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language