Definitions

1. noun

A hard, grayish-white metallic element that is a silvery-white, brittle metal, highly reactive chemically, and used in steel alloys and as a catalyst.

“The factory used manganese in the production of high-strength steel.”

2. noun

A chemical compound containing manganese, especially as a pigment or a coloring agent.

“The artist used manganese dioxide to add a reddish hue to her paintings.”