Magnesium Definition

măg-nēzē-əm, -zhəm

noun

A lightweight, silver-white, malleable and ductile, metallic chemical element, one of the alkaline-earth metals, used in making several alloys and, because it burns with a hot, white light, in photographic flashbulbs, incendiary bombs, etc.: symbol, Mg; at. no. 12

Webster's New World

The definition of magnesium is one of the most abundant elements on the face of the Earth.

YourDictionary

Magnesium's atomic symbol is Mg and it is the eighth-most plentiful element in the Earth's crust.

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Its ions are essential in all living things and it is the second-most plentiful ion in seawater.

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It is never found naturally in its elemental form on Earth because of its reactivity. It is always found combined with other minerals.

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Synonyms:

Synonyms:
atomic number 12
mg

Origin of Magnesium

From New Latin magnÄ“sium, from MagnÄ“sia (“region in Thessaly") +"Ž -ium.

From Wiktionary
From magnesia

From American Heritage Dictionary of the English Language, 5th Edition