Main Entry: bul·la

Pronunciation: \ˈbu̇-lə\

Function: noun

Inflected Form(s): plural bul·lae \ˈbu̇-ˌlē, -ˌlī\

Date: 14th century

1 [Medieval Latin] : the round usually lead seal attached to a papal bull
2 [New Latin, from Latin] : a hollow thin-walled rounded bony prominence
3 : a large vesicle or blister