The root of the English word cheese comes from the Latin caseus, which also gives us the word casein, the milk protein that is the basis of cheese. In Old English, caseus was c?ese or c?se, which became chese in Middle English, finally becoming cheese in Modern English. Caseus is also the root word for cheese in other languages, including queso in Spanish, kaas in Dutch, kase in German, and queijo in Portuguese. Caseus Formatus, or molded (formed) cheese, brought us formaticum, the term the Romans employed for the hard cheese used as supplies for the legionaries. From this root comes the French fromage and the Italian formaggio.