Caseate is a technical word used in medicine to describe the process of the formation of a type of protein called casein. As it is scientific terminology, there are not many synonyms for caseate in common usage. However, one alternative word that might be used is coagulate. This term refers to the process of something thickening or clotting, which is similar to the process of casein formation in milk. Other synonyms might include precipitate or curdle, which describe the formation of solid particles in a liquid. Although these words are not perfect substitutes for caseate, they convey a similar sense of the process of solidification or thickening.