Bulla

A bleb; a vesicle, or an elevation of the cuticle, containing a transparent watery fluid.

The ovoid prominence below the opening of the ear in the skulls of many animals; as, the tympanic or auditory bulla.

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.

A genus of marine shells. See Bubble shell.

(pathology) an elevation of the skin filled with serous fluid