The Collaborative International Dictionary of English v.0.48:

Pie \Pie\, n. [OE. pie, pye; cf. Ir. & Gael. pighe pie, also
   Gael. pige an earthen jar or pot. Cf. Piggin.]
   1. An article of food consisting of paste baked with
      something in it or under it; as, chicken pie; venison pie;
      mince pie; apple pie; pumpkin pie.
      [1913 Webster]

   2. See Camp, n., 5. [Prov. Eng.] --Halliwell.
      [1913 Webster]

   Pie crust, the paste of a pie.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pie crust
    n 1: pastry used to hold pie fillings [syn: pie crust, pie
         shell]