[muh-lib-duh-nuh m] /məˈlɪb də nəm/
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.
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
metallic element, 1816, from molybdena, used generally for lead-like minerals, from Greek molybdos “lead,” also “black graphite,” related to Latin plumbum “lead” (see plumb (n.)), and like it probably borrowed from a lost Mediterranean language, perhaps Iberian. The element so called because of its resemblance to lead ore.
molybdenum mo·lyb·de·num (mə-lĭb’də-nəm)
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.
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.
noun, Chemistry. 1. a black crystalline powder, MoS 2 , insoluble in water, used as a lubricant and as a hydrogenation catalyst.
[muh-lek-yuh-ler] /məˈlɛk yə lər/ adjective 1. of or relating to or caused by : molecular structure. /məʊˈlɛkjʊlə; mə-/ adjective 1. of or relating to molecules: molecular hydrogen 2. (logic) (of a sentence, formula, etc) capable of analysis into atomic formulae of the appropriate kind adj. 1823, from molecule + -ar or else from French moléculaire […]
- Molecular layer of cerebellar cortex
molecular layer of cerebellar cortex n. The outer layer of the cortex of the cerebellum, containing the cell bodies and dendrites of Purkinje cells, the axons of the granule cells, and the cell bodies, dendrites, and axons of basket cells.
noun 1. a segment of genetic material that inhibits the reproduction of the AIDS virus by breaking up specific areas of the virus’s genes.