n [ U ]
a soft, thick food made from peanuts which in the US is often made sweeter with sugar, and is usually spread on bread or toast. Creamy or smooth peanut butter is made from finely ground peanuts and crunchy peanut butter contains some larger pieces of nut. In the US, peanut butter and jelly sandwiches (= a sandwich containing peanut butter and fruit jam) are popular, especially with children.