manganese(redirected from manganum)
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n. Symbol Mn
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.
[French manganèse, from Italian manganese, from Medieval Latin magnēsia, mineral ingredient of the philosophers' stone; see magnesia.]
man′ga·ne′sian (-nē′zhən, -shən) adj.
(Elements & Compounds) a brittle greyish-white metallic element that exists in four allotropic forms, occurring principally in pyrolusite and rhodonite: used in making steel and ferromagnetic alloys. Symbol: Mn; atomic no: 25; atomic wt: 54.93805; valency: 1, 2, 3, 4, 6, or 7; relative density: 7.21–7.44; melting pt: 1246±3°C; boiling pt: 2062°C
[C17: via French from Italian manganese, probably altered form of Medieval Latin magnesia]
man•ga•nese(ˈmæŋ gəˌnis, -ˌniz)
a hard, brittle, grayish white, metallic element, an oxide of which, MnO2, is a valuable oxidizing agent: used chiefly as an alloying agent in strengthening steel. Symbol: Mn; at. wt.: 54.938; at. no.: 25; sp. gr.: 7.2 at 20°C.
[1670–80; < French manganèse < Italian manganese manganese dioxide, of obscure origin]
Symbol Mn A grayish-white, hard, brittle metallic element that occurs in several different minerals. It is used to increase the hardness and strength of steel and other important alloys. Atomic number 25. See Periodic Table.
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|Noun||1.||manganese - a hard brittle grey polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals|
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
hausmannite - a mineral consisting of manganese tetroxide; a source of manganese
manganite - a black mineral consisting of basic manganese oxide; a source of manganese
psilomelane - a mineral consisting of hydrated basic oxide of manganese and barium; a source of manganese
pyrolusite - a mineral consisting of manganese dioxide; an important source of manganese
rhodochrosite - a mineral consisting of manganese carbonate; a source of manganese
manganese[ˈmæŋgəniːz] n → manganèse m
n → Mangan nt