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Ester Definition: An ester is an organic compound where the hydrogen in the compound's carboxyl group is replaced with a hydrocarbon group. Examples: Ethyl acetate is an ester. The hydrogen on the carboxyl group of acetic acid is replaced with an ethyl group. Article. Chemistry.
Glycerol ester of wood rosin. Glycerol ester of wood rosin, also known as glyceryl abietate or ester gum, is an oil-soluble food additive (E number E445). The food-grade material is used in foods, beverages, and cosmetics to keep oils in suspension in water. It is also used as an ingredient in the production of chewing-gum and ice cream.