eraser

from WordNet (r) 3.0 (2006)

eraser
    n 1: an implement used to erase something

from The Collaborative International Dictionary of English v.0.48

Eraser \E*ras"er\, n.
   One who, or that which, erases; esp., a sharp instrument or a
   piece of rubber used to erase writings, drawings, etc.
   [1913 Webster]