Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

magnesium

play
noun mag·ne·sium \mag-ˈnē-zē-əm, -zhəm\

Simple Definition of magnesium

  • : a silver-white metallic element that produces a very bright white light when it burns

Source: Merriam-Webster's Learner's Dictionary

Full Definition of magnesium

  1. :  a silver-white malleable ductile light metallic element that occurs abundantly in nature and is used in metallurgical and chemical processes, in photography, signaling, and pyrotechnics because of the intense white light it produces on burning, and in construction especially in the form of light alloys — see element table

Origin of magnesium

New Latin, from magnesia


First Known Use: 1812

Rhymes with magnesium


MAGNESIUM Defined for Kids

magnesium

play
noun mag·ne·sium \mag-ˈnē-zē-əm, -ˈnē-zhəm\

Definition of magnesium for Students

  1. :  a silvery white metallic chemical element that is lighter than aluminum and is used in lightweight alloys




Medical Dictionary

magnesium

play play
noun mag·ne·sium \mag-ˈnē-zē-əm, -zhəm\

Medical Definition of magnesium

  1. :  a silver-white light malleable ductile metallic element that occurs abundantly in nature (as in bones and seeds and in the form of chlorophyll in the green parts of plants) and is used in metallurgical and chemical processes, in photography, in signaling, and in the manufacture of pyrotechnics because of the intense white light it produces on burning, and in construction especially in the form of light alloys—symbol Mg; see element table




Learn More about magnesium


Seen and Heard

What made you want to look up magnesium? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

marked by grandiloquent style

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

alt-5746713d76276

Which of these is a synonym of nonplus?

perplex reduce disapprove soothe
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ