Bulla
Bulla ({not transcribed}) , noun
[Latin bulla bubble. See Bull an edict.]
1.
(Medicine) A bleb; a vesicle, or an elevation of the cuticle, containing a transparent watery fluid.
2.
(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; 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.
4.
(Zoology) A genus of marine shells. See Bubble shell.