noun Don Car·lo [dawn kahr-law] /dɔn ˈkɑr lɔ/, Prince of Ve·no·sa [ve-naw-zah] /vɛˈnɔ zɑ/, c1560–1613, Italian composer. nounCarlo (ˈkarlo), Prince of Venosa. ?1560–1613, Italian composer, esp of madrigals