Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A mixture of finely divided solids with enough liquid to produce a pasty mass.
  • n. Geology The molten rock material under the earth's crust, from which igneous rock is formed by cooling.
  • n. Pharmacology A suspension of particles in a liquid, such as milk of magnesia.
  • n. The residue of fruits after the juice has been expressed; pomace.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The molten matter within the earth, the source of the material of lava flows, dikes of eruptive rocks, etc.
  • n. A basic algebraic structure consisting of a set equipped with a single binary operation.

from the GNU version of the Collaborative International Dictionary of English

  • n. Any crude mixture of mineral or organic matters in the state of a thin paste.
  • n.
  • n. A thick residuum obtained from certain substances after the fluid parts are expressed from them; the grounds which remain after treating a substance with any menstruum, as water or alcohol.
  • n. A salve or confection of thick consistency.
  • n.
  • n. The molten matter within the earth, the source of the material of lava flows, dikes of eruptive rocks, etc.
  • n. The glassy base of an eruptive rock.
  • n. The amorphous or homogenous matrix or ground mass, as distinguished from well-defined crystals.

from The Century Dictionary and Cyclopedia

  • n. Any crude mixture, especially of organic matters, in the form of a thin paste.
  • n. In medicine
  • n. The thick residuum obtained after subjecting certain substances to pressure to extract the fluid parts.
  • n. The grounds which remain after treating a substance with water, alcohol, or any other menstruum.
  • n. A salve of a certain degree of consistence.
  • n. A confection.
  • n. In petrol., the ground-mass or basis of a rock; that part which is amorphous or which has no decidedly individualized contours, so far as can be made out from examination of thin sections with the aid of a microscope.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. molten rock in the earth's crust

Etymologies

Middle English, sediment, dregs, from Latin, from Greek, unguent, from massein, mag-, to knead; see mag- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek μάγμα ("paste"). (Wiktionary)

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