A type of fat found within an oil. Polyunsaturated fats are found in higher quantities in vegetable oils like soybean, corn and linoleic sunflower oil. Polyunsaturated fats are simply fat molecules that have more than one unsaturated carbon bond in the molecule, this is also called a double bond. Oils that contain polyunsaturated fats are typically liquid at room temperature but start to turn solid when chilled. Polyunsaturated fat is now considered less healthy than monounsaturated fat.