The Collaborative International Dictionary of English v.0.48:

Splenic \Splen"ic\, a. [L. splenicus, Gr. splhniko`s; cf. F.
   spl['e]nique.] (Anat.)
   Of or pertaining to the spleen; lienal; as, the splenic vein.
   [1913 Webster]

   Splenic apoplexy or Splenic fever. (Med.) See Anthrax,
      n., 3.
      [1913 Webster]

WordNet (r) 3.0 (2006):

splenic
    adj 1: of or relating to the spleen [syn: splenic,
           splenetic, lienal]