Definition of "bulla"
noun:
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A blister, vesicle, or other thin-walled cavity or lesion.
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A clay envelope or hollow ball, typically with seal impressions or writing on its outside indicating its contents.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
In ancient Rome, a kind of amulet or boss.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
Later, handwritten document from the papal chancellery.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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