The Collaborative International Dictionary of English v.0.48:

Asperges \As*per"ges\, n. [L., Thou shalt sprinkle.] (R. C. Ch.)
   (a) The service or ceremony of sprinkling with holy water.
   (b) The brush or instrument used in sprinkling holy water; an
       aspergill.
       [1913 Webster] Aspergill