Curding is the process of separating milk into curds and whey. One synonym for curding is coagulation, which refers to the solidification of liquid into a gel-like substance. Another synonym is clotting, which describes the formation of a cluster or mass that obstructs the flow of liquid. Solidification, concretion, and solidifying are also synonyms for curding. These terms all describe the natural process of milk proteins bonding together to form curds. While the word curding is specific to the process of milk separation, these synonyms can be applied to other substances that undergo a solidifying or clotting process.