/ Dictionary / Index R rhachis: Meaning and Definition of Find definitions for: rha•chis Pronunciation: (rā'kis), [key] — pl. rha•chis•es, rhach•i•des rachis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rhabdovirus Rhadamanthys 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