The Collaborative International Dictionary of English v.0.48:

Aspersorium \As`per*so"ri*um\, n.; pl. Aspersoria. [LL. See
   Asperse.]
   1. The stoup, basin, or other vessel for holy water in Roman
      Catholic churches.
      [1913 Webster]

   2. A brush for sprinkling holy water; an aspergill.
      [1913 Webster] Asphalt