The Collaborative International Dictionary of English v.0.48:

Medicean \Med`i*ce"an\, prop. a.
   Of or relating to the Medici, a noted Italian family; as, the
   Medicean Venus.
   [1913 Webster]

   Medicean planets (Astron.), a name given by Galileo to the
      satellites of Jupiter.
      [1913 Webster]