bulla
UK[ˈbʊlə]US[ˈbʊlə]
n
a large blister containing serous fluid.
n
a rounded, often ornamented, metal seal attached to an official document, especially a papal edict.
Etymology
the word 'bulla' entered english directly from latin, where it signified a 'bubble' or an 'amulet', specifically a rounded, knob-like charm worn by roman children. this latin term is believed to be a loanword from gaulish, where it referred to a 'bubble' or 'blister', likely deriving from a proto-indo-european root meaning 'to swell'. the semantic connection is clear: the physical form of a bubble, a blister, and a rounded seal all share the fundamental characteristic of a rounded, swollen protuberance. in english, it retains these specialized meanings in medical and historical/ecclesiastical contexts, preserving the ancient concept of a rounded object.
Analysis
this word is a direct loanword from latin and is not productively segmented using english spelling morphemes.
Examples
the dermatologist diagnosed the skin lesion as a bulla.
the ancient papal bulla was made of lead and impressed with the pope's insignia.
friction from the new shoes caused a painful bulla on her heel.