A small, fluid-filled sac in the body that cushions bones, tendons, and muscles to reduce friction during movement.
From Medieval Latin 'bursa,' meaning 'purse' or 'bag,' borrowed from Greek 'byrsa' meaning 'hide' or 'leather.' The anatomical meaning developed because the sac resembles a small pouch.
Your body has about 150 bursae acting like tiny water balloons that keep your joints from grinding together—when they get inflamed (bursitis), even simple movements hurt!
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