S: (n) joint, articulation, articulatio ((anatomy) the point of connection between two bones or elements of a skeleton (especially if it allows motion))
S: (n) body part (any part of an organism such as an organ or extremity)
S: (n) part, piece (a portion of a natural object) "they analyzed the river into three parts"; "he needed a piece of granite"
S: (n) thing (a separate and self-contained entity)