Webster's English Dictionary

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tenon

1. ten.on \'ten-*n\ n [ME, fr. OF, fr. tenir to hold - more at TENABLE] : a 
   projecting member in a piece of wood or other material for insertion i nto 
   a mortise to make a joint
2. tenon vt 1: to unite by a tenon  2: to cut or fit for insertion in a 
   mortise