The Collaborative International Dictionary of English v.0.48:

Supply \Sup*ply"\, a.
   Serving to contain, deliver, or regulate a supply of
   anything; as, a supply tank or valve.
   [1913 Webster]

   Supply system (Zool.), the system of tubes and canals in
      sponges by means of which food and water are absorbed. See
      Illust. of Spongiae.
      [1913 Webster]