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.
verb
[with object]
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
(often as adjective mortised) cut a mortise in or through:the mortised ports
Derivatives
mortiser
noun
Origin:
late Middle English: from Old French mortaise
mortise in other Oxford dictionaries
Definition of mortise in the US English dictionary