ammonium nitrate
noun [ U ] chemistry specialized uk/əˌməʊniəm ˈnaɪtreɪt/ us/əˌmoʊniəm ˈnaɪtreɪt/
硝酸铵
a chemical compound in the form of a white powder, often used as a fertilizer (= substance to make plants grow) and in explosives (formula NH4 NO4)