1. One that planes, especially a machine tool that is used to smooth or finish the surfaces of wood or metal.
2. Printing. A smooth block of wood used to level a form of type.

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.