Relating to a diarthrosis, which is a freely movable joint in the body.
From Greek 'diarthrosis' (two-jointed movable joint) + English suffix '-al' (relating to), used in anatomical descriptions.
Diarthrodial joints like your knees and elbows are what make you flexible—animals without these joints can't move the same way, which is why jellyfish flow rather than walk.
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