Etymology
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bulla (n.)

1876, from Latin bulla (plural bullae) "round swelling, knob," literally "bubble" (see bull (n.2)).

updated on August 25, 2017

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Definitions of bulla from WordNet

bulla (n.)
(pathology) an elevation of the skin filled with serous fluid;
Synonyms: blister / bleb
bulla (n.)
the round leaden seal affixed to a papal bull;
From wordnet.princeton.edu, not affiliated with etymonline.