arcanum Meaning, Definition & Usage

  1. noun information known only to a special group
    secret.
    • the secret of Cajun cooking

WordNet

Ar*ca"num noun
Etymology
L., fr. arcanus closed, secret, fr. arca chest, box, fr. arcere to inclose. See Ark.
Wordforms
plural Arcana
Definitions
  1. A secret; a mystery; -- generally used in the plural.
    Inquiries into the arcana of the Godhead. Warburton.
  2. (Med.) A secret remedy; an elixir. Dunglison.

Webster 1913