The Collaborative International Dictionary of English v.0.48:

phocenic \pho*cen"ic\ (f[-o]*s[e^]n"[i^]k), a. [Gr. fw`kaina a
   porpoise.] (Chem.)
   Of or pertaining to dolphin oil or porpoise oil; -- said of
   an acid (called also delphinic acid) subsequently found to be
   identical with valeric acid. --Watts.
   [1913 Webster]