Definify.com
Webster 1913 Edition
Bulla
‖
1.
(Med.)
A bleb; a vesicle, or an elevation of the cuticle, containing a transparent watery fluid.
2.
(Anat.)
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.