(uncountable) A metallic chemical element (symbol Mn) with an atomic number of 25, not a free element in nature but often found in minerals in combination with iron, and useful in industrial alloy production.

plural of manganese

(metallurgy, dated) Containing manganese

(obsolete) manganiferous (containing manganese)

(chemistry, obsolete) A manganate.

plural of manganesate

(geology) a concretion of oxides of manganese and iron found on the floor of many oceans

(physics) The only stable isotope of manganese, ⁵⁵₂₅Mn, having 25 protons and 30 neutrons

(chemistry, archaic) technetium

(inorganic chemistry) The binary compound of manganese and fluorine MnF₄