The term 'vinegar jar' can be summed up in one word: CRUET. A CRUET is a small glass or ceramic container with a stopper or lid, used for holding condiments such as vinegar, oil, or syrup. Cruets are often used in restaurants and households to store and dispense condiments. They are also used in religious ceremonies, such as the Catholic Mass, where they are used to hold holy water. Cruets come in a variety of shapes and sizes, and can be made from a variety of materials, including glass, ceramic, and metal.