arcanum

• POS: Noun
• HYPHEN: ar=ca=num

CIDE DICTIONARY

arcanum, n. [L., fr. arcanus closed, secret, fr. arca chest, box, fr. arcere to inclose. See Ark.].

•  A secret; a mystery; -- generally used in the plural.  [1913 Webster]

  "Inquiries into the arcana of the Godhead."  [1913 Webster]
•  A secret remedy; an elixir.  Dunglison.  [1913 Webster]

OXFORD DICTIONARY

arcanum, n. (pl. arcana) (usu. in pl.) a mystery; a profound secret.

Etymology

L neut. of arcanus: see ARCANE

ROGET THESAURUS

arcanum

Secret

N secret, dead secret, profound secret, arcanum, mystery, latency, Asian mystery, sealed book, secrets of the prison house, le desous des cartes, enigma, riddle, puzzle, nut to crack, conundrum, charade, rebus, logogriph, monogram, anagram, Sphinx, crux criticorum, maze, labyrinth, Hyrcynian wood, intricacy, meander, problem, paradox, unintelligibility, terra incognita, secret, involved, labyrinthine, labyrinthian, mazy, confidential, top secret.