One of the mysteries of the English language finally explained.
1Engineering. A joint between metal pipes in which one pipe is cut to fit around the other. Also: a metal joint, used chiefly with sheet metal, in which the edge of one member is bent over the upturned edge of the next.
2Anatomy and Zoology. A bone joint in which the articulating surfaces are convex in one direction and concave in the other, allowing movement in two axes.
3Masonry. A joint in which the ends of adjoining blocks are shaped to direct rainwater away from the mortar in the joint.
4Woodworking. A joint used to join an upright timber to a horizontal one, formed by cutting a notch in one timber to receive a corresponding projection or tenon cut in the other.
Mid 19th century. From saddle + joint.
saddle joint/ˈsadl dʒɔɪnt/
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