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



BrE BrE//ˈmæɡmə//
; NAmE NAmE//ˈmæɡmə//
[uncountable] (specialist)
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very hot liquid rock found below the earth’s surface Word Origin late 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 the Oxford Advanced American Dictionary entry: magma