The Collaborative International Dictionary of English v.0.48:

Blender \Blend"er\, n.
   One who, or that which, blends; an instrument, as a brush,
   used in blending. Specifically, an electrical device with a
   rapidly rotating spindle to which a specially designed
   container can be attached, so that the contents of the
   container are agitated by rotating blades at adjustable
   speeds, permitting various degrees of homogenization of the
   contents. container are
   [1913 Webster]

WordNet (r) 3.0 (2006):

blender
    n 1: an electrically powered mixer with whirling blades that mix
         or chop or liquefy foods [syn: blender, liquidizer,
         liquidiser]