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Longman Dictionary of Contemporary English
▪ This displaces the calcium and magnesium ions from the resin and restores it to the sodium form.
▪ Typically a magnesium ion diffuses into the channel and gets trapped, unable to go all the way through.
▪ Those suffering from frequent or daily headaches typically have an unusually low magnesium level.
▪ As is the case for calcium, correction of potassium deficiency may not be possible until the serum magnesium level is normalized.
▪ The serum magnesium level usually ranges between 0. 3 and 1. 0 mmol / L when tetany occurs.
▪ However, if hemolysis occurs during blood drawing, falsely elevated plasma magnesium levels may be obtained.
▪ During therapy for magnesium depletion, the physician should frequently check the serum magnesium level, especially in patients with renal insufficiency.
▪ As mentioned above, to remove magnesium bicarbonate hardness requires twice as much lime as is needed for calcium bicarbonate.
▪ Calcium permanent hardness requires the more expensive sodium carbonate, whereas magnesium permanent hardness requires both lime and sodium carbonate.
▪ Drought resulted in decreased root growth and slower breakdown of soil litter, an important source of magnesium for forest trees.
▪ Experimental phosphate deficiency in humans may induce renal magnesium loss.
▪ The hypocalcemia and hypomagnesemia respond readily to administration of magnesium salts.
▪ The important minerals are calcium, zinc, iron, potassium, magnesium, phosphorus and iodine.
▪ The kidney is the principal regulator of magnesium balance.
▪ The use of diuretics in those conditions may augment the depletion of magnesium.
The Collaborative International Dictionary

Magnesium \Mag*ne"si*um\, n. [NL. & F. See Magnesia.] (Chem.) A light silver-white metallic element of atomic number 12, malleable and ductile, quite permanent in dry air but tarnishing in moist air. It burns, forming (the oxide) magnesia, with the production of a blinding light (the so-called magnesium light) which is used in signaling, in pyrotechny, or in photography where a strong actinic illuminant is required. Its compounds occur abundantly, as in dolomite, talc, meerschaum, etc. Symbol Mg. Atomic weight, 24.305. Specific gravity, 1.75.

Magnesium sulphate. (Chem.) Same as Epsom salts.

Douglas Harper's Etymology Dictionary

silvery-white metallic element, 1808, coined by English chemist Sir Humphrey Davy (1778-1829) from white magnesia (q.v.), in which it was found, + chemical ending -ium.


n. A light, flammable, silvery metal, and a chemical element (''symbol'' Mg) with an atomic number of 12.


n. a light silver-white ductile bivalent metallic element; in pure form it burns with brilliant white flame; occurs naturally only in combination (as in magnesite and dolomite and carnallite and spinel and olivine) [syn: Mg, atomic number 12]


Magnesium is a chemical element with symbol Mg and atomic number 12. It is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (Group 2, or alkaline earth metals) of the periodic table: all Group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure.

Magnesium is the ninth most abundant element in the universe. It is produced in large, aging stars from the sequential addition of three helium nuclei to a carbon nucleus. When such stars explode as supernovas, much of the magnesium is expelled into the interstellar medium where it may recycle into new star systems. Magnesium is the eighth most abundant element in the Earth's crust and the fourth most common element in the Earth (after iron, oxygen and silicon), making up 13% of the planet's mass and a large fraction of the planet's mantle. It is the third most abundant element dissolved in seawater, after sodium and chlorine.

Magnesium occurs naturally only in combination with other elements, where it invariably has a +2 oxidation state. The free element (metal) can be produced artificially, and is highly reactive (though in the atmosphere, it is soon coated in a thin layer of oxide that partly inhibits reactivity — see passivation). The free metal burns with a characteristic brilliant-white light. The metal is now obtained mainly by electrolysis of magnesium salts obtained from brine, and is used primarily as a component in aluminium-magnesium alloys, sometimes called magnalium or magnelium. Magnesium is less dense than aluminium, and the alloy is prized for its combination of lightness and strength.

Magnesium is the eleventh most abundant element by mass in the human body, and the ions are essential to all cells. Magnesium ions interact with polyphosphate compounds such as ATP, DNA, and RNA. Hundreds of enzymes require magnesium ions to function. Magnesium compounds are used medicinally as common laxatives, antacids (e.g., milk of magnesia), and to stabilize abnormal nerve excitation or blood vessel spasm in such conditions as eclampsia. Magnesium ions are sour to the taste, and in low concentrations they help impart a natural tartness to fresh mineral waters. Magnesium is the metallic ion at the center of chlorophyll, and is a common component in fertilizers.

Magnesium (pharmaceutical preparation)

Magnesium, as a pharmaceutical preparation, is used to treat conditions including magnesium deficiency and hypomagnesemia, as well as eclampsia. Magnesium is important to health.

Usually in lower dosages, magnesium is commonly included in dietary mineral preparations, including many multivitamin preparations.

Usage examples of "magnesium".

To the substances used for treating brewing liquors already mentioned we may add kainite, a naturally deposited composite salt containing potassium and magnesium sulphates and magnesium chloride.

Magnesium, aluminium, iron, zinc, nickel, cobalt, manganese, and cadmium dissolve, with evolution of hydrogen, in the cold acid, or when warmed.

Elsewhere along the face the surface of the ore was lit with arc lamps and magnesium flares, and Marchpane could see the figures of the miners made gigantic and grotesque by their harsh shadows on the glass.

The white-painted lettering on the pentaprism was totally gone, the black magnesium body was scorched and buckled, and the lens cracked completely through.

They consisted of a mixture of iron, nickel, peridotite, magnesium, and silicates.

Pinlighting consisted of the detonation of ultra-vivid miniature photonuclear bombs, which converted a few ounces of a magnesium isotope into pure visible radiance.

For example, porphyrin complexed with iron or magnesium is the nonprotein part of hemoglobin and chlorophyll.

The presence of magnesium salts is also very objectionable, as these generally remain in the burnt brick as magnesium sulphate, which gives rise to an efflorescence of fine white crystals after the bricks are built into position.

The use of magnesium flares in the arson work at United Recovery had given him the inkling that crooks had already made a secret deal in magnesium.

A column of white flame from burning magnesium fountained up over the airfield just as the one-oh-five shells began bursting in the rice paddies south of the base.

Magnesium, zinc, and copper get the same binding treatment from phytates in uncooked grain protein, which includes the wheat germ that some folks sprinkle on their salads.

The magnesium sulfate would help prevent the grand mal seizures that preeclampsia could bring on, especially in labor.

Its chief commercial sources are the salt deposits at Stassfurt in Prussian Saxony, in which magnesium bromide is found associated with various chlorides, and the brines of Michigan, Ohio, Pennsylvania and West Virginia, U.

The spores caught fire and cascaded dramatically around the skull in a magnesium brilliance of light, in stark contrast to the dark night.

Paul a whit behind when he succeeded in producing laboratory colloids exhibiting amoeba-like activities, and when he cast new light upon the processes of fertilization through his startling experiments with simple sodium chlorides and magnesium solutions on low forms of marine life.