bulla noun. ['bʊlǝ] Pl. bullae ['bʊli:]. E19.
[Latin = bubble.]
1. Medicine. A large blister on the skin containing watery fluid. Also, a thin-walled air cavity in the lung due to emphysema or of congenital origin. E19.

2. Zoology. An opisthobranch of the genus Bulla. M19.

3. Anatomy. A rounded bony prominence, esp. that of the ethmoid bone. L19.

[TahlilGaran] English Dictionary ▲