The term papilla (plural: papillae) generally means a nipple-like structure, and may refer to: Mammary papilla, or nipple Interdental papilla, part of the gingiva between teeth Dental papilla, cells involved in a developing tooth Renal papilla, in the kidney Lacrimal papilla, on the eyelid Major duodenal papilla, the opening of the pancreatic duct and common bile duct into the duodenum Minor duodenal papilla, the opening of the accessory pancreatic duct into the duodenum Hair papilla, at… (More on Papillae)