arcanum

arcanum

[ahr-key-nuhm]

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

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arcanum arcanorum

[ahr-kah-noom ahr-kah-noh-room; English ahr-key-nuhm ahr-kuh-nawr-uhm, -nohr-]
noun Latin.
secret of secrets.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
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
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Etymonline
Word Origin & History

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