Bible Dictionaries
Arcanum

Webster's Dictionary

(1):

(n.) A secret; a mystery; - generally used in the plural.

(2):

(n.) A secret remedy; an elixir.

Bibliography Information
Webster, Noah. Entry for 'Arcanum'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​a/arcanum.html. 1828.