The Collaborative International Dictionary of English v.0.48:

Spray \Spray\, n. [Probably from a Dutch or Low German form akin
   to E. spread. See Spread, v. t.]
   1. Water flying in small drops or particles, as by the force
      of wind, or the dashing of waves, or from a waterfall, and
      the like.
      [1913 Webster]

   2. (Med.)
      (a) A jet of fine medicated vapor, used either as an
          application to a diseased part or to charge the air of
          a room with a disinfectant or a deodorizer.
      (b) An instrument for applying such a spray; an atomizer.
          [1913 Webster]

   Spray condenser (Steam Engine), an injection condenser in
      which the steam is condensed by a spray of water which
      mingles with it.
      [1913 Webster]