The Collaborative International Dictionary of English v.0.48:

Terrine \Ter*rine"\, n. [F. See Tureen.]
   1. A dish or pan, originally of earthenware, such as those in
      which various dishes are cooked and served; esp., an
      earthenware jar containing some table delicacy and sold
      with its contents.
      [Webster 1913 Suppl.]

   2. (Cookery) A kind of ragout formerly cooked and served in
      the same dish; also, a dish consisting of several meats
      braised together and served in a terrine.
      [Webster 1913 Suppl.]

   3. A soup tureen.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

terrine
    n 1: a pate or fancy meatloaf baked in an earthenware casserole