Englishmagnesia /maɡˈnēZHə, , mæɡˈniʒə 
, maɡˈnēSHə, , mæɡˈniʃə , maɡˈnēsēə, , mæɡˈnisiə , maɡˈnēzēə, mæɡˈniziə /
▸ noun Chemistry magnesium oxide.
▪ hydrated magnesium carbonate used as an antacid and laxative.
– ORIGIN 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.