noun Any of the joints between the bones of the fingers.
noun A mechanical joint.
noun The curved part of the cushion at the entrance to the pockets on a cue sports table.
noun The kneejoint of a quadruped, especially of a calf; formerly, the kneejoint of a human being.
noun A cut of meat of various kinds.
Beef knuckle is from the knee joint. Pork knuckle, or ham hock, is from the joint between the tibia/fibula and the metatarsals of the foot of a pig, where the foot was attached to the leg.
noun The joint of a plant.
noun A convex portion of a vessel's figure where a sudden change of shape occurs, as in a canal boat, where a nearly vertical side joins a nearly flat bottom.
noun A contrivance, usually of brass or iron, and furnished with points, worn to protect the hand, to add force to a blow, and to disfigure the person struck; a knuckle duster.