A ball-and-socket type of joint that allows rotation of one bone around another, such as the shoulder or hip joint.
From Greek 'kyklos' (circle) plus 'arthrosis' (joint condition). The '-osis' ending typically indicates a condition or state. Medical term from 19th-century anatomy describing the mechanism of circular joint movement.
Ball-and-socket joints like your shoulder are evolutionary masterpieces—they give you incredible range of motion but are also more prone to dislocation than less mobile joints, showing the trade-offs in evolution!
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