Polyunsaturated Fat Polyunsaturated Fat
The Free Dictionary/Thesaurus by Farlex

Noun 1. polyunsaturated fat – 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 fat – a soft greasy substance occurring in organic tissue and consisting of a mixture of lipids (mostly triglycerides); "pizza has too much fat"