from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A gray-white or silvery 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 54.9380; melting point 1,244°C; boiling point 1,962°C; specific gravity 7.21 to 7.44; valence 1, 2, 3, 4, 6, 7. See Table at element.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A metallic chemical element (symbol Mn) with an atomic number of 25.
from the GNU version of the Collaborative International Dictionary of English
- n. An element obtained by reduction of its oxide, as a hard, grayish white metal, fusible with difficulty (melting point 1244° C), but easily oxidized. Its ores occur abundantly in nature as the minerals pyrolusite, manganite, etc. Symbol Mn. Atomic number 25; Atomic weight 54.938 [C=12.011].
from The Century Dictionary and Cyclopedia
- n. Chemical symbol, Mn; atomic weight, 55. A metal having a remarkable affinity for, and in some respects a close resemblance to, iron, of which it is an extremely frequent associate.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a hard brittle grey polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals
French manganèse, from Italian manganese, from Medieval Latin magnēsia, mineral ingredient of the philosophers' stone; see magnesia.(American Heritage® Dictionary of the English Language, Fourth Edition)
French manganèse, from Italian manganese, by alteration from Latin magnesia, magnesia, from Ancient Greek μαγνησία (magnēsia), after Μαγνησία (Magnēsia), Magnesia (Wiktionary)