Definition of bursa noun from the Oxford Advanced American Dictionary

 

bursa

 noun
noun
NAmE//ˈbərsə//
 
(pl. bursae
NAmE//ˈbərsi//
 
or bursas)
(anatomy)
 
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a part inside the body like a bag or sleeve, which is filled with liquid, especially around a joint so that it can work smoothly
See the Oxford Advanced Learner's Dictionary entry: bursa