In humans, the joint in the middle part of the leg.
Jessica was wearing shorts, so she skinned her exposed knees when she fell.
(skeleton) The joint, or region of the joint, between the thigh and leg.
(anatomy) In the horse and allied animals, the carpal joint, corresponding to the wrist in humans.
(shipbuilding) A piece of timber or metal formed with an angle somewhat in the shape of the human knee when bent.
1980: Deck beams were supported by hanging knees, triangular pieces of wood typically found underneath the timbers they are designed to support, but in this case found above them. — Richard W. Unger, The Ship in the Medieval Economy 600-1600, page 41.
An act of kneel, kneeling, especially to show respect or courtesy.
Give them title, knee, and approbation. Shak.
Any knee-shaped item or sharp angle in a line, "the knee of a graph", an inflection point
Any of the joints between the bones of the fingers.
By extension of (1) a mechanical joint.
A cut of meat.
(context, sports, billiards, snooker, pool) The curved part of the cushion at the entrance to the pockets on a cue sports table.