nindexniacin./nahy-uh-sin/US // ˈnaɪ ə sɪn //UK // (ˈnaɪəsɪn) //烟酸,烟碱酸,烟酰胺,烟碱液Definitionsn.noun · 名词1. Biochemistry.›nicotinic acid. Level 3More words in n →