When someone becomes excited, their pupils can dilate to up to four times their original size. Conversely, an angry, negative mood causes the pupils to contract to what are commonly known as 'beady little eyes' or 'snake eyes'. Lighter eyes can look more attractive because it's easier to see the dilation taking place.
The term papilla (plural: papillae) generally means a nipple-like structure, and may refer to: Mammary papilla, or nipple. Amphibian papilla and basal papilla, part of the inner ear of the frog. Interdental papilla, part of the gingiva between teeth.
the papilla in the duodenum for the common opening of the bile duct and the pancreatic duct. mammary papilla. the teat or nipple of the mammary gland. marginal tongue papilla. temporary filiform papillae in puppies, piglets and kittens which are thought to facilitate sucking. optic papilla. optic disk.