mag·​ma | \ ˈmag-mə How to pronounce magma (audio) \

Definition of magma

1 archaic : dregs, sediment
2 : a thin pasty suspension (as of a precipitate in water)
3 : molten rock material within the earth from which igneous rock results by cooling

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Other Words from magma

magmatic \ mag-​ˈma-​tik How to pronounce magma (audio) \ adjective

Examples of magma in a Sentence

Recent Examples on the Web Migrating magma flows can also force rock apart, generating volcano-tectonic earthquakes. Robin George Andrews, Wired, 6 June 2021 Migrating magma flows can also force rock apart, generating volcano-tectonic earthquakes. Quanta Magazine, 1 June 2021 Thanks to some large-scale and truly fascinating geologic phenomena, the magma supplying the Nyiragongo volcano is packed with dissolved carbon dioxide. Robin Andrews, Forbes, 31 May 2021 The danger of the magma moving under the ground and building up in the volcano was the most pressing concern. New York Times, 27 May 2021 The magma that supplies Mount Nyiragongo has a low viscosity and flows very easily, reaching speeds of 60 mph (90 kmph), threatening the population of Goma and its surrounding areas. David Bressan, Forbes, 23 May 2021 Large impacts to Mars may have shaken up the subsurface magma, much like large earthquakes have been linked to volcanic eruptions. Ashley Strickland, CNN, 15 May 2021 And in places where the crust split, Martian magma erupted out of fissures. Quanta Magazine, 6 Apr. 2021 When the planet was originally formed, some of its atmosphere dissolved in the magma, while the star stripped away the rest. Asa Stahl, Chron, 19 Mar. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'magma.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of magma

15th century, in the meaning defined at sense 1

History and Etymology for magma

Middle English, from Latin magmat-, magma, from Greek, thick unguent, from massein to knead — more at mingle

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Learn More About magma

Time Traveler for magma

Time Traveler

The first known use of magma was in the 15th century

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Statistics for magma

Last Updated

14 Jun 2021

Cite this Entry

“Magma.” Dictionary, Merriam-Webster, Accessed 21 Jun. 2021.

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More Definitions for magma



English Language Learners Definition of magma

technical : hot liquid rock below the surface of the Earth


mag·​ma | \ ˈmag-mə How to pronounce magma (audio) \

Kids Definition of magma

: molten rock within the earth


mag·​ma | \ ˈmag-mə How to pronounce magma (audio) \

Medical Definition of magma

1 : a crude mixture of mineral or organic matter in the state of a thin paste
2 : a suspension of a large amount of precipitated material (as in milk of magnesia) in a small volume of a watery vehicle

More from Merriam-Webster on magma

Nglish: Translation of magma for Spanish Speakers Encyclopedia article about magma


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