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English definition of “polyunsaturated”

polyunsaturated

adjective uk   /ˌpɒl.i.ʌnˈsætʃ.ər.eɪ.tɪd/ us    /ˌpɑː.li.ʌnˈsætʃ.ə.reɪ.t̬ɪd/ specialized
describes a fat or oil that has a chemical structure that does not easily change into cholesterol (= a substance containing a lot of fat that can cause heart disease) because it contains several double bonds: polyunsaturated margarine/vegetable oil Fats and oils in food and cookingThe state of matter
(Definition of polyunsaturated from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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