Pronunciation: (bool'u, bul'u), [key]
—pl. bul•laePronunciation: (bool'ē, bul'ē). [key]
1. a seal attached to an official document, as a papal bull.
2. an ancient Roman pendant, consisting of a rounded box containing an amulet.
3. Pathol.a large vesicle.
4. Zool.a blisterlike or bubblelike prominence of a bone, as that of the tympanic bone in the skull of certain mammals.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.