Origin: L. Bulla bubble. See bull an edict.
1. (Science: medicine) a bleb; a vesicle, or an elevation of the cuticle, containing a transparent watery fluid.
2. (Science: anatomy) The ovoid prominence below the opening of the ear in the skulls of many animals; as, the tympanic or auditory bulla.
3. A leaden seal for a document; especially. 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.
4. (Science: zoology) a genus of marine shells. See Bubble shell.