Source : Webster's Revised Unabridged Dictionary (1913)

Ream \Ream\, v. t. [imp. & p. p. {Reamed}; p. pr. & vb. n.
   {Reaming}.] [Cf. G. r["a]umen to remove, to clear away, fr.
   raum room. See {Room}.]
   To bevel out, as the mouth of a hole in wood or metal; in
   modern usage, to enlarge or dress out, as a hole, with a
   reamer.