Definition of magnesia noun from the Oxford Advanced Learner's Dictionary

 

magnesia

 noun
noun
BrE BrE//mæɡˈniːʒə//
 
, also BrE//mæɡˈniːziə//
 
; NAmE NAmE//mæɡˈniːʃə//
 
[uncountable]
 
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a white substance containing magnesium, used to help with indigestion Word 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.
See the Oxford Advanced American Dictionary entry: magnesia

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