[ mag-muh ]
/ ˈmæg mə /

noun, plural mag·mas, mag·ma·ta [mag-muh-tuh] /ˈmæg mə tə/.

Geology. molten material beneath or within the earth's crust, from which igneous rock is formed.
any crude mixture of finely divided mineral or organic matter.
Chemistry, Pharmacology. a paste composed of solid and liquid matter.

Origin of magma

1400–50; late Middle English < Latin: dregs, leavings < Greek mágma kneaded mass, salve, equivalent to mag- (base of mássein to knead, press; see mass) + -ma noun suffix of result


mag·mat·ic [mag-mat-ik] /mægˈmæt ɪk/, adjectivemag·ma·tism, noun


lava magma Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for magma

British Dictionary definitions for magma

/ (ˈmæɡmə) /

noun plural -mas or -mata (-mətə)

a paste or suspension consisting of a finely divided solid dispersed in a liquid
hot molten rock, usually formed in the earth's upper mantle, some of which finds its way into the crust and onto the earth's surface, where it solidifies to form igneous rock

Derived forms of magma

magmatic (mæɡˈmætɪk), adjectivemagmatism, noun

Word Origin for magma

C15, from Latin: dregs (of an ointment), from Greek: salve made by kneading, from massein to knead
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for magma

[ măgmə ]


A mixture of finely divided solids with enough liquid to produce a pasty mass.
A suspension of particles in a liquid, such as milk of magnesia.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for magma

[ măgmə ]

Plural magmata (măg-mä) or magmas

The molten rock material that originates under the Earth's crust and forms igneous rock when it has cooled. When magma cools and solidifies beneath the Earth's surface, it forms what are known as intrusive rocks. When it reaches the Earth's surface, it flows out as lava and forms extrusive (or volcanic) rocks.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Culture definitions for magma


Molten rock usually located deep within the mantle of the Earth that occasionally comes to the surface through cracks in the mantle or through the eruption of volcanoes.

notes for magma

When magma cools and solidifies, it forms igneous rock, of which lava is one type.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.