[bool-uh, buhl-uh]
noun, plural bullae [bool-ee, buhl-ee] .
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.

1840–50; < Latin: bubble, also stud, boss, knob (whence Medieval Latin bulla official seal)

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World English Dictionary
bulla (ˈbʊlə, ˈbʌlə)
n , pl -lae
1.  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
2.  an ancient Roman rounded metal or leather box containing an amulet, worn around the neck
3.  pathol another word for blister
4.  anatomy a rounded bony projection
[C19: from Latin: round object, bubble]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1876, from L. bulla (pl. bullae), lit. "bubble" (see bull (2)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

bulla bul·la (bul'ə)
n. pl. bul·lae (bul'ē)

  1. A large blister or vesicle of pathological origin.

  2. A bubblelike structure.

bul'lous adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
In severe cases, they are multiple blisters, called bullae.
The distribution of the lesions is unusual--the bullae appear only in areas where the skin has been exposed to light.
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