ARCANUM

arcanum. Arcanum, n. a secret, mystery, nostrum

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‖Ar‐ca″num (�), n.; pl. Arcana (�). [[L., fr. arcanus closed, secret, fr. arca chest, box, fr. arcere to inclose. See Ark.]] 1. 1. A secret; a mystery; — generally used in the plural.
Inquiries into the arcana of the Godhead. Warburton. 2. 2. (Med.) A secret remedy; an elixir. Dunglison.