No, trans fatty acid is an unsaturated fatty acid, and the hydrogen atoms on the carbon-carbon double bond in its chemical structure are located on different sides, which makes the molecule present a linear conformation. This conformation makes trans fatty acids solid at room temperature, but it is not easy to be digested and absorbed in human body. Ricin ester is an ester compound, and its chemical structure contains an ester group and several carbon chains. This compound is liquid at room temperature and has a certain viscosity. It does not contain trans bonds, so it is not a trans fatty acid. Therefore, ricinoleic acid is not a trans fatty acid.