molybdenum

[muh-lib-duh-nuhm]
noun Chemistry.
a silver-white metallic element, used as an alloy with iron in making hard, high-speed cutting tools. Symbol: Mo; atomic weight: 95.94; atomic number: 42; specific gravity: 10.2.

Origin:
1810–20; < Neo-Latin, alteration of earlier molybdēna < Latin molybdaena < Greek molýbdaina galena, equivalent to mólybd(os) lead + -aina suffix of appurtenance

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World English Dictionary
molybdenum (mɒˈlɪbdɪnəm)
 
n
a very hard ductile silvery-white metallic element occurring principally in molybdenite: used mainly in alloys, esp to harden and strengthen steels. Symbol: Mo; atomic no: 42; atomic wt: 95.94; valency: 2--6; relative density: 10.22; melting pt: 2623°C; boiling pt: 4639°C
 
[C19: from New Latin, from Latin molybdaena galena, from Greek molubdaina, from molubdos lead]

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Etymonline
Word Origin & History

molybdenum
metallic element, 1816, from Gk. molybdos "lead," related to L. plumbum "lead," and like it probably borrowed from a lost Mediterranean language, perhaps Iberian. The element so called because of its resemblance to lead ore.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

molybdenum mo·lyb·de·num (mə-lĭb'də-nəm)
n.
Symbol Mo
A hard metallic element that is an essential trace element in plant and animal nutrition. Atomic number 42; atomic weight 95.94; melting point 2,623°C; boiling point 4,639°C; specific gravity 10.22 (at 20°C); valence 2, 3, 4, 5, 6.

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Science Dictionary
molybdenum   (mə-lĭb'də-nəm)  Pronunciation Key 
Symbol Mo
A hard, silvery-white metallic element that resists corrosion and retains its strength at high temperatures. It is used to harden and toughen steel and to make high-temperature wiring. molybdenum is an essential trace element in plant metabolism. Atomic number 42; atomic weight 95.94; melting point 2,617°C; boiling point 4,612°C; specific gravity 10.22 (at 20°C); valence 2, 3, 4, 5, 6. See Periodic Table.
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Example sentences
Sulfurous fractions are mixed with hydrogen and a cobalt-molybdenum catalyst, yielding hydrogen sulfide.
Chromium, molybdenum and silicon make it more likely that the alloy will exhibit the bcc crystal structure at room temperature.
It is a so-called companion metal, left over from molybdenum production, itself a by-product of copper mining.
Molybdenite, a relatively inexpensive mineral of molybdenum disulfide, has a layered structure similar to that of raw graphite.
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