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mortise

mortise noun
also British mortice /ˈmoɚtəs/
plural mortises
mortise
noun
also British mortice /ˈmoɚtəs/
plural mortises
Britannica Dictionary definition of MORTISE
[count] technical
: a hole that is cut in a piece of wood or other material so that another piece (called a tenon) will fit into it to form a connection