noun
: a compound Mn 3 O 4 or MnMn 2 O 4 found in nature as hausmannite and obtained as a reddish brown powder by strongly heating manganese oxides or hydroxides in air — called also manganomanganic oxide, red manganese oxide
noun
: a compound Mn 3 O 4 or MnMn 2 O 4 found in nature as hausmannite and obtained as a reddish brown powder by strongly heating manganese oxides or hydroxides in air — called also manganomanganic oxide, red manganese oxide
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012