Dictionary.com

magnesium

[ mag-nee-zee-uhm, -zhuhm, -shee-uhm ]
/ mægˈni zi əm, -ʒəm, -ʃi əm /
Save This Word!

noun Chemistry.
a light, ductile, silver-white, metallic element that burns with a dazzling white light, used in lightweight alloys, flares, fireworks, in the manufacture of flashbulbs, optical mirrors, and precision instruments, and as a zinc substitute in batteries. Symbol: Mg; atomic weight: 24.312; atomic number: 12; specific gravity: 1.74 at 20°C.

COMPARE COMMONLY CONFUSED WORDS

These are smilar words, and share related meanings, but their uses are very different. Click on the buttons to learn more about these commonly confused words.
QUIZ
QUIZ YOURSELF ON AFFECT VS. EFFECT!
In effect, this quiz will prove whether or not you have the skills to know the difference between “affect” and “effect.”
Question 1 of 7
The rainy weather could not ________ my elated spirits on my graduation day.
Meet Grammar CoachWrite or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing
Meet Grammar CoachImprove Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

Origin of magnesium

From New Latin, dating back to 1800–10; see origin at magnesia, -ium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use magnesium in a sentence

British Dictionary definitions for magnesium

magnesium
/ (mæɡˈniːzɪəm) /

noun
a light silvery-white metallic element of the alkaline earth series that burns with an intense white flame, occurring principally in magnesite, dolomite, and carnallite: used in light structural alloys, flashbulbs, flares, and fireworks. Symbol: Mg; atomic no: 12; atomic wt: 24.3050; valency: 2; relative density: 1.738; melting pt: 650°C; boiling pt: 1090°C

Word Origin for magnesium

C19: New Latin, from magnesia
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for magnesium

magnesium
[ măg-nēzē-əm, -zhəm ]

n. Symbol Mg
A light metallic element that burns with a brilliant white flame, used in various analgesic, antiseptic, anticonvulsant, and antacid pharmaceuticals. Atomic number 12.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for magnesium

magnesium
[ măg-nēzē-əm ]

Mg
A lightweight, moderately hard, silvery-white metallic element of the alkaline-earth group that burns with an intense white flame. It is an essential component of chlorophyll and is used in lightweight alloys, flash photography, and fireworks. Atomic number 12; atomic weight 24.305; melting point 649°C; boiling point 1,090°C; specific gravity 1.74 (at 20°C); valence 2. See Periodic Table.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
FEEDBACK