Source : Webster's Revised Unabridged Dictionary (1913)

Reamer \Ream"er\, n.
   One who, or that which, reams; specifically, an instrument
   with cutting or scraping edges, used, with a twisting motion,
   for enlarging a round hole, as a bore of a cannon, etc.

Source : WordNet®

reamer
     n 1: a squeezer with a conical ridged center that is used for
          squeezing juice from citrus fruit [syn: {juicer}, {juice
          reamer}]
     2: a drill that is used to shape or enlarge holes