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miter square

American  

noun

  1. an instrument for laying out miter joints, consisting of two straightedges joined at a 45° angle.

Etymology

Origin of miter square

First recorded in 1670–80

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.