Breadcrumb Home > Dictionary > Index A arcanum arcanorum*: Meaning and Definition of Find definitions for: ar•ca•num ar•ca•no•rum Pronunciation: (är-kä'noom är"kä-nō'room Eng. är-kā'n&schwam är"k&schwa-nôr'&schwam, -nōr'-), [key] — Latin. Latin. secret of secrets. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. arcanum Arcaro ✖ Related Content Daily Word Quiz: dishabille Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language