A freely movable joint in the body, like a knee, elbow, or shoulder, that allows movement in multiple directions.
From Greek 'dia-' (between) + 'arthrosis' (articulation or joint), literally meaning 'between-joint' or 'movable joint'.
Your diarthroses have a special fluid (synovial fluid) that works like nature's oil change system—it lubricates your joints and keeps them working smoothly for decades.
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