1590–1600; < Latin, neuter (used as noun) of arcānus arcane Unabridged

arcanum arcanorum

[ahr-kah-noom ahr-kah-noh-room; English ahr-key-nuhm ahr-kuh-nawr-uhm, -nohr-]
noun Latin.
secret of secrets. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
arcanum (ɑːˈkeɪnəm)
n , pl -na
1.  (sometimes plural) a profound secret or mystery known only to initiates
2.  a secret of nature sought by alchemists
[C16: from Latin; see arcane]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

proper singular form of arcana (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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