Webster's English Dictionary

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bulla

bul.la \'bu.l-*\ \'bu.l-.e-, -.i-\ \'bu.l-.a-t\ n or bul.lae [ML] [NL, fr. 
   L] pl  1: the round usu. lead seal attached to a papal bull  2: a hollow 
   thin-walled rounded bony prominence  3: a large vesicle or blister  - 
   bul.late aj