magnesium /ˌmæɡˈniːzi.əm/ noun2 •The chemical element with an atomic number of 12. It is a light, easily flammable, silvery-white alkaline earth metal.The building looked only like a wall glowing in the firelight, but sometimes a barrage of magnesium blue light made its windowframes jump out of the darkness. — 1999 •An atom of this element.
