cornetto UK /kɔːˈnɛtəʊ/US /kɔɹˈnɛtoʊ/ noun2 •An Italian pastry, a kind of croissant.A quick espresso, maybe a roll with a little marmalade or a cornetto at the local bar, and then it's off to work or school. — 2008 •A trumpet-like wind instrument used in European music of the medieval, Renaissance, and Baroque periods. formscornetti · cornettos