The Collaborative International Dictionary of English v.0.48:

Delphinic \Del*phin"ic\, a. [See Delphin, n.] (Chem.)
   Pertaining to, or derived from, the dolphin; phocenic.
   [1913 Webster]

   Delphinic acid. (Chem.) See Valeric acid, under
      Valeric. [Obs.]
      [1913 Webster]