fon ‧ due /ˈfɒndjuː $ fɑːnˈduː/ BrE AmE noun [uncountable and countable]
[ Date: 1800-1900 ; Language: French ; Origin: past participle of fondre 'to melt' ]
a dish made of melted cheese, hot oil, or chocolate into which you put small pieces of meat, fruit etc using a long fork