Gruyere is a noun that refers to a type of hard, pale yellow Swiss cheese made from cow's milk. It is commonly used as a cooking ingredient in dishes such as fondue or quiche, but can also be served on its own as a cheese platter. It is also used as a descriptor for dishes or recipes that feature gruyere cheese, such as "gruyere gratin" or "gruyere-stuffed mushrooms." Additionally, it can be used as an informal term to describe something as classy, sophisticated, or elegant. For example, "She hosted a gruyere and wine night for her friends."