柯林斯词典pyroxylin /paɪˈrɒksɪlɪn/ 1. N a yellow substance obtained by nitrating cellulose with a mixture of nitric and sulphuric acids; guncotton: used to make collodion, plastics, lacquers, and adhesives 硝酸纤维素; 火棉 返回 pyroxylin