1 /ˈpraɪmə(r) ||; ˈpraɪmɚ/ [C,U] a type of paint that is put on wood, metal, etc before it is painted to help the paint to stay on the surface 底漆；底层涂料

2 /ˈpraɪmə(r) ||; ˈprɪmɚ/ [C] (US 美) a book that contains basic instructions, explanations, etc 初级读本；入门书: The President doesn't need a primer on national security. 总统对于国家安全事务是不需要读入门书的。