bursa
/ˈbɜːsə/noun
(pl. bursae /-siː/ 或 bursas)
- Anatomy a fluid-filled sac or sac-like cavity, especially one countering friction at a joint【剖】囊, 黏液囊。
派生词
bursal
adjective词源
early 19th cent.: from medieval Latin， 'bag， purse'， from Greek bursa 'leather'.