Knee n. : In man, the joint in the middle part of the leg.

Knee n. : The joint, or region of the joint, between the thigh and leg.

Knee n. : In the horse and allied animals, the carpal joint, corresponding to the wrist in man.

Knee n. : A piece of timber or metal formed with an angle somewhat in the shape of the human knee when bent.

Knee n. : A bending of the knee, as in respect or courtesy.

Knee v. t. : To supplicate by kneeling.

Example:
How do I get rid of Knee pain that only cracking the Knee relieves?

Taxonomy
knee, ligaments, femur, tibia, knee joint, Platzer, menisci, cruciate ligaments, extension, patella, rotation, cruciate ligament, flexion, stretches, lateral rotation, injury, bursae, collateral ligaments.

Defination from the web:
knee supports nearly the entire weight of the body, it is the joint most vulnerable both to acute injury and the development of osteoarthritis. ... The knee (also known as gyena)is a complex, compound, condyloid variety of a synovial joint. ...