# bulla

> English word · Noun · IPA /bˈulə/ · frequency rank #71,361

## Definitions
1. A blister, vesicle, or other thin-walled cavity or lesion, as
2. A blister, vesicle, or other thin-walled cavity or lesion, as:
3. A clay envelope or hollow ball, typically with seal impressions or writing on its outside indicating its contents.
4. In ancient Rome, a kind of amulet or boss.
5. A handwritten document from the papal chancellery.
6. Any of several hollow structures as features of bones.
7. Any of several hollow structures as features of bones.

## Etymology
Borrowed from Latin bulla (“bubble”). Doublet of bill and bull (“papal bull; bubble”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/bulla