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mitre joint

British  

noun

  1. Sometimes shortened to: mitre.  a corner joint formed between two pieces of material, esp wood, by cutting bevels of equal angles at the ends of each piece

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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The other groove is taken from the outer angle of the mitre joint inwards.

From Project Gutenberg