Manganese n. : An element obtained by reduction of its oxide, as a hard, grayish white metal, fusible with difficulty, but easily oxidized. Its ores occur abundantly in nature as the minerals pyrolusite, manganite, etc. Symbol Mn. Atomic weight 54.8.

Example:
What is being oxidized in the Manganese dioxide and hydrochloric acid reaction?

Taxonomy
manganese, manganese dioxide, oxidation state, manganese ore, iron, steel, Manganese compounds, minerals, manganese content, batteries, element, compounds, South Africa, glass, metal, Australia, magnesia, oxides.

Defination from the web:
... As a free element, manganese is a metal with important industrial metal alloy uses, particularly in stainless steels. ...