noun, plural magmas, magmata [mag-muh-tuh] .
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.

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

magmatic [mag-mat-ik] , adjective
magmatism, noun

lava, magma. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
magma (ˈmæɡmə)
n , pl -mas, -mata
1.  a paste or suspension consisting of a finely divided solid dispersed in a liquid
2.  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
[C15, from Latin: dregs (of an ointment), from Greek: salve made by kneading, from massein to knead]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1420, "dregs," from L. magma "dregs of an ointment," from Gk. magma "an ointment," from root of massein "to knead, mold," from PIE *mag- "kneading" (see macerate). Geological meaning "molten rock" is 1865.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

magma mag·ma (māg'mə)

  1. A mixture of finely divided solids with enough liquid to produce a pasty mass.

  2. 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.
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American Heritage
Science Dictionary
magma   (māg'mə)  Pronunciation Key 
Plural magmata (māg-mä'tə) 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 © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

magma definition

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.

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

Magma definition

symbolic mathematics, tool
A program used for heavy duty algebraic computation in many branches of mathematics. Magma, developed by John Cannon and associates at the University of Sydney, succeeded Cayley. It runs at several hundred sites.
E-mail: .
[W. Bosma, J. Cannon and C. Playoust, The Magma algebra system I: The user language, J. Symb. Comp., 24, 3/4, 1997, 235-265].
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
The result is a shower of new particles, which give clues to the nature of the
  cosmic magma.
With the magma chamber emptied, the surface collapses.
Magma chambers still lie beneath many geothermal regions.
Granite is magma that slowly cooled underground into a hodgepodge of
  crystalline minerals.
Image for magma
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