Definition: The word "ammonea" was first used in ancient Egyptian texts for a type of salt. It is also called ammone or ammonium, which has been found in various forms throughout the world. Ammonea can be made by adding ammonium chloride to water and then letting it sit for several days. It is sometimes used as a preservative in food, particularly for seafood and meat products. In modern times, ammonea is often used as a salt substitute or an ingredient in various recipes.