arcanum

ar·ca·num

noun \är-ˈkā-nəm\

plural ar·ca·na\-nə\

Definition of ARCANUM

1

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

2

: elixir 1

Origin of ARCANUM

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

First Known Use: 15th century