What does bullae mean?
Bullae is the plural of bulla, a Latin word meaning 'bubble', and it serves two distinct technical purposes in modern English. In medicine, bullae are large, thin-walled, air-filled pockets: in the lungs they are a hallmark of emphysema, where destroyed alveolar walls merge into cavernous spaces that impair breathing, while on the skin they describe unusually large blisters, exceeding roughly half a centimetre, filled with clear fluid or air. In archaeology and ancient history, bullae are rounded lumps of clay or lead bearing the impression of a seal, used across the ancient Near East and Mediterranean to authenticate documents and secure containers; the term also covers the bulbous gold amulet pendants worn by Roman boys. Because of these specialized uses, the word belongs to formal, clinical, and scholarly registers rather than everyday speech, but it remains indispensable for describing pathology and ancient administrative practice with precision.
nounBullae is the plural of bulla, denoting either large, air-filled blisters on the skin or lung tissue (as in emphysema) or the rounded seal-like pendants and stamped seals of antiquity.
- Large, thin-walled, air-filled spaces or blisters, especially in the lungs of people with emphysema or as large blisters on the skin.
- In archaeology and history: rounded clay or lead seals impressed with a signet, attached to documents in the ancient world, or ornamental pendant amulets worn in ancient Rome.
"The chest X-ray revealed several large bullae in the patient's upper lobes."
"Surgical removal of the bullae can improve breathing in selected patients with severe emphysema."
"Archaeologists uncovered dozens of clay bullae bearing the seal impressions of biblical-era scribes."
Bullae is itself the standard plural of bulla, following the Latin first-declension pattern; the anglicized 'bullas' appears occasionally but is not preferred in professional writing.
"Both lungs contained multiple bullae visible on the CT scan."
The same little Latin word for 'bubble' names both the giant air pockets that can riddle an emphysema sufferer's lungs and the clay seals that kings pressed onto documents thousands of years ago.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of bullae
Bullae comes from Latin bulla, meaning 'bubble' or 'knobbed object', which also gave rise to the medieval Latin bulla for a sealed document — the ancestor of the papal 'bull' and of 'bulletin'. The medical sense preserves the original image of a bubble, applied to fluid- or air-filled swellings, while the archaeological sense reflects the rounded lump of clay used as a seal. Related derivatives include the adjectives bullous and bullate, both common in dermatological description.
Related word forms
How bullae is actually used
Bullae is a technical term used chiefly in medicine (especially pulmonology and dermatology) and in archaeology and classics. It is formal register and rarely appears in casual conversation; lay readers more often encounter the singular bulla or plain English terms like 'blister'. The Latin-style plural is standard in professional writing, though 'bullas' occasionally appears informally.
Easily confused with bullae
Bulla is the singular form referring to one blister or seal, while bullae is its irregular Latin-style plural referring to more than one.
A bullet is a projectile fired from a gun, unrelated in meaning despite sharing a Latin root with bulla via words for a sealed document or bubble-like mass.