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

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

Wiktionary

(physics) The major stable isotope of magnesium, ²⁴₁₂Mg, having twelve protons and twelve neutrons; it amounts to about 79% of the element in nature.

Wiktionary

(physics) A minor stable isotope of magnesium, ²⁵₁₂Mg, having twelve protons and thirteen neutrons; it amounts to about 10% of the element in nature.

Wiktionary

(physics) A minor stable isotope of magnesium, ²⁶₁₂Mg, having twelve protons and fourteen neutrons; it amounts to about 11% of the element in nature.

Wiktionary

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