A large blister containing serous fluid. The patient had a bulla on his foot that needed to be drained.
A round seal attached to an official document, especially a papal bull. The ancient document was authenticated by the presence of a bulla.
A hollow, thin-walled, rounded bony prominence. The radiologist noted the presence of a bulla in the lung X-ray.
In ancient Rome, a rounded metal amulet worn around a child's neck as a protective charm. The archaeologists discovered a child’s grave containing a small bronze bulla.