Malpighi, Marcello Syllabification: (Mal·pi·ghi, Marcello)Pronunciation: /malˈpigē, mäl-/Definition of Malpighi, Marcello (circa 1628–94), Italian microscopist. He discovered the alveoli and capillaries in the lungs and the fibers and red cells of clotted blood, and he demonstrated the pathway of blood from arteries to veins. Malpighi, Marcello in other Oxford dictionaries Definition of Malpighi, Marcello in the British & World English dictionary