arcanum

[ahr-key-nuhm]
noun, plural arcana [ahr-key-nuh] .
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; < Latin, neuter (used as noun) of arcānus arcane

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World English Dictionary
arcana (ɑːˈkeɪnə, -ˈkɑː-)
 
n
either of the two divisions (the minor arcana and the major arcana) of a pack of tarot cards

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

arcana
"hidden things," 1590s, a direct adoption from Latin of plural of arcanum, from L. neut. of adj. arcanus "secret, hidden" (see arcane). Occasionally mistaken for a singular and pluralized as arcanas since arcana is far more common than arcanum.

arcanum
proper singular form of arcana (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Become an instant expert of football's regulations and arcana.
He deftly makes computer arcana palatable, even interesting.
Suddenly, the legal arcana, courtroom theatrics and judicial niceties are bathed in a political veneer.
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