bursa
noun [ C ] medical specialized uk/ˈbɜː.sə/ us/ˈbɝː.sə/ bursae /ˈbɜː.saɪ/ /ˈbɝː.saɪ/
囊
a sac (= part of the body like a bag) that is filled with fluid and protects tissue from injury due to friction
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