Definition of magnesia in English:

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Pronunciation: /maɡˈnēZHə/
Pronunciation: /maɡˈnēSHə/
Pronunciation: /maɡˈnēsēə/
Pronunciation: /maɡˈnēzēə/


1Magnesium oxide.
  • Chemical formula: MgO.
Example sentences
  • But neither of these qualifies: lime is calcium oxide, a compound of calcium and oxygen, and magnesia is magnesium oxide.
1.1Hydrated magnesium carbonate used as an antacid and laxative.
Example sentences
  • Or sometimes medicine such as milk of magnesia can be mixed with chocolate or strawberry-flavored milk.
  • Another option to help reduce discomfort and speed healing is dabbing a mixture of equal parts water and hydrogen peroxide directly on the sore, followed by a bit of milk of magnesia.
  • I had a colonoscopy last fall and the doctor said that I could take milk of magnesia as often as needed.


Late Middle English (referring to a mineral said to be an ingredient of the philosopher's stone): via medieval Latin from Greek Magnēsia, denoting a mineral from Magnesia in Asia Minor.

Words that rhyme with magnesia

Lucretia, Rhodesia, Venetia

For editors and proofreaders

Syllabification: mag·ne·sia

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