arcanum ar·ca·no·rum
| \ -nəˌmärkəˈnōrəm \
Definition of arcanum arcanorum
: the mystery of mysteries
specifically
: the one ultimate secret supposed to lie behind all astrology, alchemy, and magic
Test Your Vocabulary
Which Word Does Not Belong?
-
- Which of these words does not mean "nonsense"?

Test your visual vocabulary with our 10-question challenge!
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share arcanum arcanorum