bulla

/ˈbʊlə/

Other forms: bullae; bullas

Definitions of bulla

1. noun

   the round leaden seal affixed to a papal bull
   type of:

   seal, stamp

   a device incised to make an impression; used to secure a closing or to authenticate documents
2. noun

   (pathology) an elevation of the skin filled with serous fluid
   synonyms: bleb, blister

   types:

   water blister

   blister containing a nonpurulent clear watery content

   blood blister

   blister containing blood or bloody serum usually caused by an injury

   pustule

   a small inflamed elevation of skin containing pus; a blister filled with pus

   pock

   a pustule in an eruptive disease

   type of:

   cyst, vesicle

   a small anatomically normal sac or bladderlike structure (especially one containing fluid)