"The smile" is a literal English equivalent of the Italian phrase il sorriso. The masculine singular definite article and noun also may be rendered into English as "grin," "the grin," and "smile" since English does not use the definite article every time that Italian does. The pronunciation will be "eel sor-REE-so" in Italian.
il sorriso
Amo il tuo sorriso! is a literal Italian equivalent of the English phrase "I love your smile!" The declaration/exclamation models a difference between the two languages whereby Italian employs definite articles -- il, in this case -- where English does not employ "the." The pronunciation will be "A-mo eel TOO-o sor-REE-so" in Italian.
Il in Italian means "the" in English.
Il messaggio in Italian is "the message" in English.
Il placet in Italian means "the permit" in English.
Il Cenacolo in Italian is "The Last Supper" in English.
Il pescecane in Italian means "the dogfish" in English.
Il piede in Italian means "the foot" in English.
Il genio in Italian is "the genius" in English.
Il fortunato in Italian means "the lucky one" in English.
"The best!" in English is Il migliore! in Italian.
"The mentalist" in English is il mentalista in Italian.