arcanum
n. மறைபொருள், இரகசியம், மாமருந்து, சஞ்சீவி.
Ar*ca"num, n.; pl. Arcana. Etym: [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. Inquiries into the arcana of the Godhead. Warburton. 2. (Med.) Defn: A secret remedy; an elixir. Dunglison.