Noun mortise joint has 2 senses

• mortise joint(n = noun.body) ankle, ankle joint, articulatio talocruralis - a gliding joint between the distal ends of the tibia and fibula and the proximal end of the talus; Array
has parts: anklebone, astragal, astragalus, talus
is a part of leg
is a kind of articulatio plana, gliding joint

• mortise joint(n = noun.artifact) mortise-and-tenon joint - a joint made by inserting tenon on one piece into mortise holes in the other; Array
has particulars: dovetail, dovetail joint, tongue and groove joint
is a kind of joint
has parts: mortice, mortise, tenon