bulla

 
Pronunciation: /ˈbʊlə/

noun (plural bullae /ˈbʊliː/)

  • 1 Medicine a large blister containing serous fluid.
  • an abnormal air-filled cavity in the lung.
  • 2 Anatomy a rounded prominence.
  • 3a round seal attached to a papal bull, typically one made of lead.

Origin:

Latin, literally 'bubble'