Significatio vocis bulla | Babel Free

Definitiones

1. a bubble
   declension-1, feminine
2. a swollen or bubble-shaped object
   declension-1, feminine
3. a knob, boss, or stud, as on doors, shields, etc.
   declension-1, feminine
4. a bulla: a protective (usually golden) amulet worn by upper-class Roman children
   declension-1, feminine, historical
5. a round metallic seal certifying official medieval documents, particularly the golden imperial seal and the leaden papal one.
   Medieval-Latin, declension-1, feminine, historical
6. a papal bull or other official document sealed with a bulla
   Medieval-Latin, declension-1, feminine

Aequivalentia

Gradus CEFR