Sémillon Syllabification: (Sé·mi·llon)Pronunciation: /sāmē(l)ˈyôN/Definition of Sémillon noun a variety of white wine grape grown in France and elsewhere. a white wine made from the Sémillon grape. Origin:French dialect, based on Latin semen 'seed'Sémillon in other Oxford dictionaries Definition of Sémillon in the British & World English dictionary