Citron, also known as Citrus medica, is a fragrant but inedible citrus fruit. The citron fruit is usually oblong and covered with a leathery adherent rind. The color of the citron varies from green to orange-yellow. It differs from the rest of the citrus species, such as oranges or lemons, by having a dry pulp that contains just a small levels of juice. For many centuries, citron is used for medical purposes (against pulmonary and gastric-intestinal disorders), and for production of the essential oil, which not only smells nice but also possesses antibiotic properties.