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The Collaborative International Dictionary of English v.0.48:

Arcanum \Ar*ca"num\, n.; pl. Arcana. [L., fr. arcanus closed, secret, fr. arca chest, box, fr. arcere to inclose. See Ark.] 1. A secret; a mystery; -- generally used in the plural. [1913 Webster] Inquiries into the arcana of the Godhead. --Warburton. [1913 Webster] 2. (Med.) A secret remedy; an elixir. --Dunglison. [1913 Webster]