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

magma

noun
 
/ˈmæɡmə/
 
/ˈmæɡmə/
[uncountable] (specialist)
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  1. very hot liquid rock found below the earth’s surface
    Word Originlate Middle English (in the sense ‘residue of dregs after evaporation ’or‘ pressing of a semi-liquid substance’): via Latin from Greek magma (from massein ‘knead’).
See magma in the Oxford Advanced American DictionarySee magma in the Oxford Learner's Dictionary of Academic English
Check pronunciation: magma

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