arcanum

/ɑɹˈkeɪnəm/

noun

A mystery or deep secret.
An elixir or secret remedy.

Similar Words

arc /ɑːk/ arcade /ɑːˈkeɪd/ arcades arcane /ɑɹˈkeɪn/ arced /ɑːkt/ arch /ɑːt͡ʃ/ archaeological archaeologists archaic /ɑː.ˈkeɪ.ɪk/ archaised