noun
magma
MAG-muh
noun
1
Molten rock beneath the Earth's surface, which becomes lava when it erupts.
"Scientists monitor the volcano for signs of rising magma."
"The chamber of magma had been building pressure for decades."
How to Use Magma
Learner’s notesIn plain EnglishMolten rock still underground; once it erupts to the surface it's called lava instead.
Easily confused with
Common pairings
magma chamber
molten magma
Word Forms
magmas plural, magmata plural
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Etymology
From Greek mágma ("paste, thick ointment").