noun.
A device for converting a substance, especially a perfume or medicine, to a fine spray.
The Century Dictionary and Cyclopedia
noun.
One who or that which atomizes or reduces to atoms or very small particles; specifically, an apparatus designed to reduce a liquid to spray for disinfecting, cooling, perfuming, medicinal, and other purposes. Also spelled atomiser.
the GNU version of the Collaborative International Dictionary of English
noun.
One who, or that which, atomizes; esp., an instrument for reducing a liquid to spray for disinfecting, cooling, or perfuming.