/ Dictionary / Index C caduceus: Meaning and Definition of Find definitions for: ca•du•ce•us Pronunciation: (ku-d'sē-us, -sys, -shus, -dy'-), [key] — pl. -ce•i the staff carried by Mercury as messenger of the gods. a representation of this staff used as an emblem of the medical profession and as the insignia of the U.S. Army Medical Corps. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: caduceus (Thesaurus) cadreman caducity Related Content Daily Word Quiz: respite Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language