curd -
To cause to coagulate or thicken; to cause to congeal; to curdle.
Wikipedia
Curds are a dairy product obtained by curdling (coagulating) milk with rennet or an edible acidic substance such as lemon juice or vinegar, and then draining off the liquid portion. Milk that has been left to sour (raw milk alone or pasteurized milk with added lactic acid bacteria or yeast) will also naturally produce curds, and sour milk cheese is produced this way. The increased acidity causes the milk proteins to tangle into solid masses, or curds.