- (n.) A leaden seal for a document; especially 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.
- (n.) A genus of marine shells. See Bubble shell.
- (n.) A bleb; a vesicle or an elevation of the cuticle, containing a transparent watery fluid.
- (n.) The ovoid prominence below the opening of the ear in the skulls of many animals; as, the tympanic or auditory bulla.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). bulla. Retrieved September 23, 2026, from http://smartdefine.org/bulla/definitions/1983041 |
| Chicago | Webster's. 2011. "bulla" http://smartdefine.org/bulla/definitions/1983041 (accessed September 23, 2026). |
| Harvard | Webster's 2011, bulla, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/bulla/definitions/1983041>. |
| MLA | Webster's. "bulla" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/bulla/definitions/1983041> |