un·sat·ur·ated fatBrE /ʌnˌsætʃəreɪtɪd ˈfæt/ 🔊NAmE /ʌnˌsætʃəreɪtɪd ˈfæt/ 🔊 noun [uncountable, countable] a type of fat found in nuts, seeds and vegetable oils that does not encourage the harmful development of cholesterol 不饱和脂肪◆Avocados are high in unsaturated fat. 油梨富含不饱和脂肪。🔊🔊 ➡ see also monounsaturated fat, polyunsaturated fat, saturated fat, trans-fatty acid