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Definition of: bulla
(bl′ə, bul′ə) noun plural bul·lae (bool′·ē, bul′ē)
1. A seal of lead, used by the Pope, or of gold or other metal used by the Greek and early German emperors and sovereigns.
2. Pathol. A small blister or large vesicle filled with watery serum; a bleb. [<L, seal]
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