*fat² n 1 [U] the substance under the skin of people and animals which helps to keep them warm 〔人和动物皮下的〕脂肪 2 [C,U] a substance contained in foods such as milk, cheese, butter etc 〔牛奶、乳酪、牛油等食物中的〕脂肪 3 [C,U] a thick oily substance taken from animals or plants and used in cooking 烹饪用油: Fry the potatoes in oil or vegetable fat. 用油或植物油来炸马铃薯。