a grayish-white, metallic chemical element, usually hard and brittle, which rusts like iron but is not magnetic: it is used in the manufacture of alloys of iron, aluminum, and copper: symbol, Mn; at. no. 25
Origin of manganeseFrench manganèse from Italian manganese, by metathesis from Medieval Latin magnesia: see magnesia
A gray-white brittle metallic element, occurring in several allotropic forms, found worldwide, especially in the ores pyrolusite and rhodochrosite and in nodules on the ocean floor. It is alloyed with steel to increase strength, hardness, wear resistance, and other properties and with other metals to form highly ferromagnetic materials. Atomic number 25; atomic weight 54.938; melting point 1,246°C; boiling point 2,061°C; specific gravity 7.21 to 7.44; valence 1, 2, 3, 4, 5, 6, 7. See Periodic Table.
Origin of manganeseFrench manganèse from Italian manganese from Medieval Latin magnēsia mineral ingredient of the philosophers' stone ; see magnesia .
(countable and uncountable, plural manganeses)
- A metallic chemical element (symbol Mn) with an atomic number of 25.