The Collaborative International Dictionary of English v.0.48:

Ampulla \Am*pul"la\, n.; pl. Ampull[ae]. [L. ]
   1. (Rom. Antiq.) A narrow-necked vessel having two handles
      and bellying out like a jug.
      [1913 Webster]

   2. (Eccl.)
      (a) A cruet for the wine and water at Mass.
      (b) The vase in which the holy oil for chrism, unction, or
          coronation is kept. --Shipley.
          [1913 Webster]

   3. (Biol.) Any membranous bag shaped like a leathern bottle,
      as the dilated end of a vessel or duct; especially the
      dilations of the semicircular canals of the ear.
      [1913 Webster]