Function: noun
Date: 1866
: a dark insoluble compound MnO 2 used especially as an oxidizing agent, as a depolarizer of dry cells, and in making glass and ceramics
Function: noun
Date: 1866
: a dark insoluble compound MnO 2 used especially as an oxidizing agent, as a depolarizer of dry cells, and in making glass and ceramics
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012