Definition of the word zest

The word "zest" has its origins in the 14th century. It comes from the Old French "est", meaning "essence" or "juice". This Old French word is derived from the Latin "ustum", meaning "dried juice" or "essence". Initially, the word "zest" referred to the dried and powdered juice of citrus fruits, particularly orange and lemon, which was used as a flavoring agent in cooking and medicine. Over time, the meaning of "zest" expanded to include the colorful, flavorful outer layer of citrus fruits, which is used as a garnish or in baked goods, such as cakes and cookies. Today, "zest" is commonly used to describe not only the outer layer of citrus fruits but also the enthusiasm, excitement, or energy that someone brings to a situation.