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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.
The standard system for naming esters uses the suffix -oate to indicate that a molecule is an ester. The two organic radicals (which are often carbon chains) labelled R1 and R2 in the diagram at the top of this page are also identified in the name of the compound, or molecule drawn-out to represent the compound.