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arcanum

[ahr-key-nuh m] /ɑrˈkeɪ nəm/
noun, plural arcana
[ahr-key-nuh] /ɑrˈkeɪ nə/ (Show IPA)
1.
Often, arcana. a secret; mystery.
2.
a supposed great secret of nature that the alchemists sought to discover.
3.
a secret and powerful remedy.
Origin
1590-1600
1590-1600; < Latin, neuter (used as noun) of arcānus arcane

arcanum arcanorum

[ahr-kah-noo m ahr-kah-noh-roo m; English ahr-key-nuh m ahr-kuh-nawr-uh m, -nohr-] /ɑrˈkɑ nʊm ˌɑr kɑˈnoʊ rʊm; English ɑrˈkeɪ nəm ˌɑr kəˈnɔr əm, -ˈnoʊr-/
noun, Latin.
1.
secret of secrets.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for arcanum

arcanum

/ɑːˈkeɪnəm/
noun (pl) -na (-nə)
1.
(sometimes pl) a profound secret or mystery known only to initiates
2.
a secret of nature sought by alchemists
Word Origin
C16: from Latin; see arcane
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for arcanum
n.

proper singular form of arcana.

Online Etymology Dictionary, © 2010 Douglas Harper
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