单词 | manganese dioxide |
释义 | manganese dioxidenoun Manganese (iv) oxide, a grey-black solid, MnO2, which occurs naturally as pyrolusite and is used as a catalyst, oxidizing agent, depolarizer in dry cells, and pigment. OriginMid 19th century; earliest use found in Henry Roscoe (1833–1915), chemist and university administrator. |
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