from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An instrument with straight edges that are set at a 45° angle or that are adjustable, used for marking the angles of a miter joint.

from the GNU version of the Collaborative International Dictionary of English

  • n. a bevel with an immovable arm at an angle of 45°, for striking lines on stuff to be mitered; also, a square with an arm adjustable to any angle.


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