hoisin Syllabification: (hoi·sin)Pronunciation: /ˈhoisin, hoiˈsin/ (also hoisin sauce)Definition of hoisin noun a sweet, spicy, dark red sauce made from soybeans, vinegar, sugar, garlic, and various spices, widely used in southern Chinese cooking. hoisin in other Oxford dictionaries Definition of hoisin in the British & World English dictionary