mono·un·sat·ur·ated fatBrE /ˌmɒnəʊʌnˌsætʃəreɪtɪd ˈfæt/ 🔊NAmE /ˌmɑːnoʊʌnˌsætʃəreɪtɪd ˈfæt/ 🔊 noun [countable, uncountable] a type of fat found, for example, in olives and nuts, which does not encourage the harmful development of cholesterol 单不饱和脂肪（橄榄和坚果等中所含脂肪，不会促进胆固醇的有害增长） ➡ see also polyunsaturated fat, saturated fat, trans-fatty acid, unsaturated fat