polyunsaturated : Idioms & Phrases
polyunsaturated fat
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noun a class of fats having long carbon chains with many double bonds unsaturated with hydrogen atoms; used in some margarines; supposedly associated with low blood cholesterol
WordNet
polyunsaturated fatty acid
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noun an unsaturated fatty acid whose carbon chain has more than one double or triple valence bond per molecule; found chiefly in fish and corn and soybean oil and safflower oil