manganese dioxide
noun
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.
Origin
Mid 19th century; earliest use found in Henry Roscoe (1833–1915), chemist and university administrator.
- openness
- open newel
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- open one's mind to
- open one's mouth
- open order
- open outcry
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- open scale