arcanum

noun ar·ca·num \är-ˈkā-nəm\

plural ar·ca·na\-nə\

Definition of ARCANUM

: mysterious or specialized knowledge, language, or information accessible or possessed only by the initiate —usually used in plural

: elixir 1

Latin, from neuter of arcanus secret, from arca chest — more at ark

First Known Use: 15th century

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