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 榫孔,榫眼
verb
[with obj. and adverbial]join securely by using a mortise and tenon 用榫舌榫眼连接 ■[with obj.][often as adj. mortised]cut a mortise in or through 开榫眼 the mortised ports. 开了榫眼的舷窗。