magnesium oxide

noun

Definition of magnesium oxide

: a white highly infusible compound MgO used especially in refractories, cements, insulation, and fertilizers, in rubber manufacture, and in medicine as an antacid and mild laxative

Examples of magnesium oxide in a Sentence

Recent Examples on the Web Lime plaster coatings or magnesium oxide boards have to be applied to anything touching hempcrete, or the lime will calcify it and lose its ability to absorb and release water. Adam Popescu, New York Times, "There’s No Place Like Home, Especially if It’s Made of Hemp," 29 Jan. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'magnesium oxide.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of magnesium oxide

1866, in the meaning defined above

Keep scrolling for more

Learn More about magnesium oxide

Time Traveler for magnesium oxide

Time Traveler

The first known use of magnesium oxide was in 1866

See more words from the same year

Statistics for magnesium oxide

Cite this Entry

“Magnesium oxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/magnesium%20oxide. Accessed 3 Jul. 2020.

Keep scrolling for more

More Definitions for magnesium oxide

magnesium oxide

noun

Medical Definition of magnesium oxide

: a white highly infusible compound MgO used especially in refractories, cements, insulation, and fertilizers, in rubber manufacture, and in medicine as an antacid and mild laxative

More from Merriam-Webster on magnesium oxide

Britannica.com: Encyclopedia article about magnesium oxide

Comments on magnesium oxide

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

WORD OF THE DAY

See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

A More Exception(al) Quiz

  • hot dog  hot dog  hot dog  hot dog cat
  • Which of the following words is not a synonym for ‘a young person’?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Citation

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

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!