[ bool-uh, buhl-uh ]
/ ˈbʊl ə, ˈbʌl ə /
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noun, plural bul·lae [bool-ee, buhl-ee]. /ˈbʊl i, ˈbʌl i/.
a seal attached to an official document, as a papal bull.
an ancient Roman pendant, consisting of a rounded box containing an amulet.
Pathology. a large vesicle.
Zoology. a blisterlike or bubblelike prominence of a bone, as that of the tympanic bone in the skull of certain mammals.
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Origin of bulla

1840–50; <Latin: bubble, also stud, boss, knob (whence Medieval Latin bulla official seal)
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How to use bulla in a sentence

British Dictionary definitions for bulla

/ (ˈbʊlə, ˈbʌlə) /

noun plural -lae (-liː)
a leaden seal affixed to a papal bull, having a representation of Saints Peter and Paul on one side and the name of the reigning pope on the other
an ancient Roman rounded metal or leather box containing an amulet, worn around the neck
pathol another word for blister (def. 1)
anatomy a rounded bony projection

Word Origin for bulla

C19: from Latin: round object, bubble
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012