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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.
Another type of organic molecules, called esters, make up vegetable and animal oils and fats. One of the important properties of organic compounds is the presence of structural units called functional groups. These are groups of atoms within a molecule that is joined to the rest of the molecule by a covalent bond between an atom of the functional group and a carbon atom in the molecule's main body.