The Collaborative International Dictionary of English v.0.48:

Reem \Reem\, v. t. [Cf. Ream to make a hole in.] (Naut.)
   To open (the seams of a vessel's planking) for the purpose of
   calking them.
   [1913 Webster]

   Reeming iron (Naut.), an iron chisel for reeming the seams
      of planks in calking ships.
      [1913 Webster]