sandwich / bread roll
panini
pah-NEE-noh
In English, 'panini' is used as a singular, but in Italian panini is the plural of panino. A tramezzino is a triangular sandwich made with soft white bread, a different product.
Mangio un panino con prosciutto e mozzarella a pranzo.
I eat a sandwich with ham and mozzarella for lunch.
Compro il panino alla rosticceria vicino all'ufficio.
I buy the sandwich at the deli near the office.