manganese dioxide


manganese dioxide
/mæŋgəˌniz daɪˈɒksaɪd/ (say mangguh.neez duy'oksuyd)

noun
a heavy black powder, MnO2, occurring naturally as pyrolusite; used as a source of metallic manganese, as an oxidising agent, and as a catalyst.
Also, manganese peroxide.

Australian English dictionary. 2014.