bulla

bul·la  (bl)

n. pl. bul·lae (bl)

1. A round seal affixed to a papal bull.

2. Pathology A large blister or vesicle.

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[Medieval Latin, from Latin, bubble, seal.]

Thesaurus

Noun	1.	bulla - (pathology) an elevation of the skin filled with serous fluid bleb, blister vesicle, cyst - a small anatomically normal sac or bladderlike structure (especially one containing fluid) pathology - the branch of medical science that studies the causes and nature and effects of diseases 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
	2.	bulla - the round leaden seal affixed to a papal bull seal, stamp - a device incised to make an impression; used to secure a closing or to authenticate documents