Spaghetti is a long, thin, cylindrical pasta of Italian origin. Spaghetti is made of semolina or flour and water. Italian dried spaghetti is made from durum wheat semolina, but outside of Italy it may be made with other kinds of flour. Traditionally, most spaghetti was 50 cm (20 in) long, but shorter lengths gained in popularity during the latter half of the 20th century and now spaghetti is most commonly available in 25–30 cm (10–12 in) lengths. A variety of pasta dishes are based on it, from spaghetti alla Carbonara or garlic and oil to a spaghetti with tomato sauce, meat and other sauces. Spaghetti is the plural form of the Italian word spaghetto, which is a diminutive of spago, meaning "thin string" or "twine".