Meaning of arcanum

ar•ca•num

Pronunciation: (är-kā'num), [key]
— pl. -na
  1. Often,a secret; mystery.
  2. a supposed great secret of nature that the alchemists sought to discover.
  3. a secret and powerful remedy.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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