Synonyms for Mortise Joint (same or very similar meaning)
WordNet sense 1 (a gliding joint between the distal ends of the tibia and fibula and the proximal end of the talus):
ankle, ankle joint, articulatio talocruralisWordNet sense 2 (a joint made by inserting tenon on one piece into mortise holes in the other):
mortise-and-tenon jointFrom the ODE community, based on WordNetadd/edit