Definitions for molybdenum
məˈlɪb də nəmmo·lyb·de·num

Princeton's WordNetRate this definition:5.0 / 1 vote

1. molybdenum, Mo, atomic number 42noun

   a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel

GCIDERate this definition:0.0 / 0 votes

1. Molybdenumnoun

   A rare element of the chromium group, occurring in nature in the minerals molybdenite and wulfenite, and when reduced obtained as a hard, silver-white, difficulty fusible metal. Symbol Mo. Atomic number 42. Atomic weight 95.94.

WiktionaryRate this definition:0.0 / 0 votes

1. molybdenumnoun

   a metallic chemical element (symbol Mo) with an atomic number of 42.

2. Etymology: From molybdenum, from μόλυβδος, because the two elements are so similar they were often confused.

WikipediaRate this definition:0.0 / 0 votes

1. Molybdenum

   Molybdenum is a chemical element with the symbol Mo and atomic number 42 which is located in period 5 and group 6. The name is from Neo-Latin molybdaenum, which is based on Ancient Greek Μόλυβδος molybdos, meaning lead, since its ores were confused with lead ores. Molybdenum minerals have been known throughout history, but the element was discovered (in the sense of differentiating it as a new entity from the mineral salts of other metals) in 1778 by Carl Wilhelm Scheele. The metal was first isolated in 1781 by Peter Jacob Hjelm.Molybdenum does not occur naturally as a free metal on Earth; it is found only in various oxidation states in minerals. The free element, a silvery metal with a grey cast, has the sixth-highest melting point of any element. It readily forms hard, stable carbides in alloys, and for this reason most of the world production of the element (about 80%) is used in steel alloys, including high-strength alloys and superalloys. Most molybdenum compounds have low solubility in water, but when molybdenum-bearing minerals contact oxygen and water, the resulting molybdate ion MoO2−4 is quite soluble. Industrially, molybdenum compounds (about 14% of world production of the element) are used in high-pressure and high-temperature applications as pigments and catalysts. Molybdenum-bearing enzymes are by far the most common bacterial catalysts for breaking the chemical bond in atmospheric molecular nitrogen in the process of biological nitrogen fixation. At least 50 molybdenum enzymes are now known in bacteria, plants, and animals, although only bacterial and cyanobacterial enzymes are involved in nitrogen fixation. These nitrogenases contain an iron-molybdenum cofactor FeMoco, which is believed to contain either Mo(III) or Mo(IV). This is distinct from the fully oxidized Mo(VI) found complexed with molybdopterin in all other molybdenum-bearing enzymes, which perform a variety of crucial functions. The variety of crucial reactions catalyzed by these latter enzymes means that molybdenum is an essential element for all higher eukaryote organisms, including humans.

ChatGPTRate this definition:0.0 / 0 votes

1. molybdenum

   Molybdenum is a chemical element with the symbol Mo and atomic number 42. It is a silver-gray metal in the transition series of the periodic table. Molybdenum is an essential element for human, animal and plant health and it plays an important role in a number of biological processes, including the production of enzymes. It is also used in various applications in metallurgy, including in alloys and as a catalyst in the petroleum industry.

Webster DictionaryRate this definition:0.0 / 0 votes

1. Molybdenumnoun

   a rare element of the chromium group, occurring in nature in the minerals molybdenite and wulfenite, and when reduced obtained as a hard, silver-white, difficulty fusible metal. Symbol Mo. Atomic weight 95.9

2. Etymology: [NL.: cf. F. molybdne. See Molybdena.]

WikidataRate this definition:0.0 / 0 votes

1. Molybdenum

   Molybdenum is a Group 6 chemical element with the symbol Mo and atomic number 42. The name is from Neo-Latin Molybdaenum, from Ancient Greek Μόλυβδος molybdos, meaning lead, since its ores were confused with lead ores. Molybdenum minerals have been known into prehistory, but the element was discovered in 1778 by Carl Wilhelm Scheele. The metal was first isolated in 1781 by Peter Jacob Hjelm. Molybdenum does not occur naturally as a free metal on Earth, but rather in various oxidation states in minerals. The free element, which is a silvery metal with a gray cast, has the sixth-highest melting point of any element. It readily forms hard, stable carbides in alloys, and for this reason most of world production of the element is in making many types of steel alloys, including high strength alloys and superalloys. Most molybdenum compounds have low solubility in water, but the molybdate ion MoO42− is soluble and forms when molybdenum-containing minerals are in contact with oxygen and water. Industrially, molybdenum compounds are used in high-pressure and high-temperature applications, as pigments and catalysts.

Chambers 20th Century DictionaryRate this definition:5.0 / 1 vote

1. Molybdenum

   mol-ib-dē′num, n. a rare metal of a silvery-white colour—also Molybdē′na.—ns. Molyb′date, a compound of molybdic acid with a base; Molybdē′nite, sulphide of molybdenum.—adjs. Molybdē′nous, Molyb′dic.—n. Molybdō′sis, lead-poisoning. [L.,—Gr.,—molybdos, lead.]

U.S. National Library of MedicineRate this definition:0.0 / 0 votes

1. Molybdenum

   A metallic element with the atomic symbol Mo, atomic number 42, and atomic weight 95.94. It is an essential trace element, being a component of the enzymes xanthine oxidase, aldehyde oxidase, and nitrate reductase. (From Dorland, 27th ed)

Editors ContributionRate this definition:0.0 / 0 votes

1. molybdenum

   An element.

   Molybdenum is an element in the Earth's crust and abundant element in its oceans and in the Universe. uses for molybdenum include catalysts for the petroleum industry, inks for circuit boards, pigments and electrodes

   
   

   Submitted by MaryC on November 20, 2015  

Matched Categories

1. • Metallic Element

How to pronounce molybdenum?

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How to say molybdenum in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of molybdenum in Chaldean Numerology is: 5

2. Pythagorean Numerology

   The numerical value of molybdenum in Pythagorean Numerology is: 7

Examples of molybdenum in a Sentence

1. Seth Shostak:

   If the aliens are here, you gotta say theyre the best houseguests ever, because they never do anything, they just buzz around. They dont address climate change; they dont steal our molybdenum.

2. Jaroslaw Romanowski:

   In the fourth quarter we expect further growth of copper and molybdenum output. The EBITDA( earnings before interest, taxes, depreciation and amortization) level should be positive in the fourth quarter.

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References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=molybdenum
2. ^ GCIDE
   https://gcide.gnu.org.ua/?q=molybdenum
3. ^ Wiktionary
   https://en.wiktionary.org/wiki/Molybdenum
4. ^ Wikipedia
   https://en.wikipedia.org/wiki/Molybdenum
5. ^ ChatGPT
   https://chat.openai.com
6. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/molybdenum
7. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=molybdenum
8. ^ Chambers 20th Century Dictionary
   https://www.gutenberg.org/files/37683/37683-h/37683-h.htm#:~:text=molybdenum