arcana

noun /ɑɹˈkeɪnə/

1. Specialized knowledge that is mysterious to the uninitiated.

   uncountable

   If since thy bright creation, thou hast seen Ought like a Newton, whose admitted eye The arcana of the universe explored Light's subtle ray its mechanism disclosed, The impetuous comet his mysterious lore Unfolded,

   Thou deign'st no answer,—or I fain would ask

Where it comes from

From Latin arcānus (“hidden, secret”), from arcēre (“to withhold”), arca (“a chest”).

Adapted from the Wiktionary entry arcana (CC BY-SA 4.0).

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