Source : Webster's Revised Unabridged Dictionary (1913)

Atomizer \At"om*i`zer\ ([a^]t"[u^]m*[imac]`z[~e]r), n.
   One who, or that which, atomizes; esp., an instrument for
   reducing a liquid to spray for disinfecting, cooling, or
   perfuming.

Source : WordNet®

atomizer
     n : a dispenser that turns a liquid (such as perfume) into a
         fine spray [syn: {atomiser}, {spray}, {sprayer}]