mortise
noun
[ ˈmɔːtɪs ]
• a hole or recess cut into a part which is designed to receive a corresponding projection (a tenon) on another part so as to join or lock the parts together.
• "a mortise and tenon joint"
mortise
verb
• join securely by using a mortise and tenon.
• "the top plate of the rudder assembly can be mortised to the top of the rudder post"
Origin:
late Middle English: from Old French mortaise .
