What does "bulla" mean?

Bulla: (Anat.) The ovoid prominence below the opening of the ear in the skulls of many animals; as, the tympanic or auditory bulla.

Additional senses

  1. 2.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.
  2. 3.(Zoöl.) A genus of marine shells. See Bubble shell.

Sources