Carpentry. a power machine for removing the rough or excess surface from a board.
Metalworking. a machine for cutting flat surfaces, having a cutting tool supported by an overhead frame beneath which the work slides back and forth. Compare shaper ( def 2 ).
Typesetting. a block of smooth, hard wood for leveling the type in a chase by tapping with a mallet.

1375–1425; late Middle English; see plane2, -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
planer (ˈpleɪnə)
1.  a machine with a cutting tool that makes repeated horizontal strokes across the surface of a workpiece: used to cut flat surfaces into metal
2.  a machine for planing wood, esp one in which the cutting blades are mounted on a rotating drum
3.  printing a flat piece of wood used to level type in a chase
4.  any person or thing that planes

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
We did the same with a metal planer, shaving curls of metal from the metal
The weather may hold some of the crowds back and fishermen may have a little
  more room to maneuver with those planer boards.
Wood residues from the sawmill and planer mill areas are both used onsite as
  fuel, as well as sold to outside parties.
The planer shavings and trimmer sawdust is pneumatically conveyed to the
  planner mill shavings cyclone.
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