Uncia is a Latin term that refers to a unit of measurement for weight. There are several synonyms for uncia which include ounce, a weight measurement unit commonly used for gold, silver, and other precious metals. Other words that are synonymous with uncia include troy ounce, a measurement unit mainly used for precious metals and apothecaries' ounce, a unit mainly used in pharmacy for measuring drugs. Additionally, carat, karat, and scruple are synonyms of uncia. Carat measures the purity of gold or the weight of diamonds, while scruple measures 20 grains or ^1⁄3 of a dram. All these synonyms are essential in different industries.