bursa
- n a city in northwestern Turkey
- n a small fluid-filled sac located between movable parts of the body especially at joints
- During training camp staph infected a bursa sac, which acts as a cushion between bones, in Manning's left knee.
- Somewhat like a small collapsed balloon, the bursa has lax walls and a slick lubricated interior surface that equips it to absorb friction.
- The other type of lymphocyte, the B-cell, undergoes differentiation, in chickens, at least, in an organ called the bursa of Fabricius.