The Collaborative International Dictionary of English v.0.48:

Oracular \O*rac"u*lar\, a. [L. oracularius. See Oracle.]
   1. Of or pertaining to an oracle; uttering oracles;
      forecasting the future; as, an oracular tongue.
      [1913 Webster]

   2. Resembling an oracle in some way, as in solemnity, wisdom,
      authority, obscurity, ambiguity, dogmatism.
      [1913 Webster]

            They have something venerable and oracular in that
            unadorned gravity and shortness in the expression.
                                                  --Pope.
      [1913 Webster] -- O*rac"u*lar*ly, adv. --
      O*rac"u*lar*ness, n.
      [1913 Webster]