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unsaturated fat

(Science: biochemistry) A fat that contains a carbon-carbon double bond, or a fat containing unsaturated fatty acids, such a fatty acid has double or triple covalent bonds and is thus able to add more atoms. Unsaturated fats are believed to lower blood cholesterol levels and are found at high levels in vegetable oils (olive oil, safflower oil, etc.) As a general rule, unsaturated fats are liquid at room temperature.