bul·la /ˈbʊlə/
 大炮


 bul·la /ˈbʊlə/ 名詞
 (複bullae)泡,大皰,乞門片,前緣脹部


 Bul·la n.; pl. Bullæ
 1. Med. A bleb; a vesicle, or an elevation of the cuticle, containing a transparent watery fluid.
 2. Anat. The ovoid prominence below the opening of the ear in the skulls of many animals; as, the tympanic or auditory bulla.
 3. A leaden seal for a document; esp. the round leaden seal attached to the papal bulls, which has on one side a representation of St. Peter and St. Paul, and on the other the name of the pope who uses it.
 4. Zool. A genus of marine shells. See Bubble shell.

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 bulla
      n 1: (pathology) an elevation of the skin filled with serous
           fluid [syn: blister, bleb]
      2: the round leaden seal affixed to a papal bull
      [also: bullae (pl)]