The term CHEESE INGREDIENT can be solved by the 4-letter word CURD. CURD is a dairy product made from coagulated milk, which is an essential ingredient in cheese production. It is also used to make yogurt and other dairy products. CURD is made by adding an acid or enzyme to milk, which causes it to separate into solid curds and liquid whey. The curds are then drained and pressed into blocks or molds, resulting in a variety of cheeses.