GNU Collaborative International Dictionary of English

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1.       
   ‖Bulla , n.; pl. Bullæ . [L. bulla bubble. See Bull an edict.]
   (Med.) A bleb; a vesicle, or an elevation of the cuticle, containing a transparent watery fluid.
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   (Anat.) The ovoid prominence below the opening of the ear in the skulls of many animals; as, the tympanic or auditory bulla.
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   A leaden seal for a document; esp. the round leaden seal attached to the papal bulls, which has on one side a representation of St. Peter and St. Paul, and on the other the name of the pope who uses it.
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   (Zool.) A genus of marine shells. See Bubble shell.
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