Source : Webster's Revised Unabridged Dictionary (1913)

Sprayer \Spray"er\, n.
   One that sprays; any instrument for vaporizing and spraying
   liquids.

Source : WordNet®

sprayer
     n 1: a worker who applies spray to a surface
     2: a dispenser that turns a liquid (such as perfume) into a
        fine spray [syn: {atomizer}, {atomiser}, {spray}]