an instrument for laying out miter joints, consisting of two straightedges joined at a 45° angle.
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Origin of miter square
First recorded in 1670–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for miter square
The miter-square, Fig. 201, is a try-square fixed at an angle of 45°.Handwork in Wood|William Noyes