bulla

Noun
  1. (pathology) an elevation of the skin filled with serous fluid (synset 105525488)
    referred to in: pathology - the branch of medical science that studies the causes and nature and effects of diseases
    is a type of: cyst, vesicle - a small anatomically normal sac or bladderlike structure (especially one containing fluid)
    subtypes:
    • 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
    same as: bleb, blister
  2. The round leaden seal affixed to a papal bull (synset 102919153)
    is a type of: seal, stamp - a device incised to make an impression; used to secure a closing or to authenticate documents

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