Definition of bursa noun from the Oxford Advanced Learner's Dictionary

 

bursa

 noun
noun
BrE BrE//ˈbɜːsə//
 
; NAmE NAmE//ˈbɜːrsə//
 
(pl. bursae
BrE BrE//ˈbɜːsiː//
 
; NAmE NAmE//ˈbɜːrsiː//
 
, 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 Word Origin early 19th cent.: from medieval Latin, ‘bag, purse’, from Greek bursa ‘leather’.
See the Oxford Advanced American Dictionary entry: bursa