Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geology one of the major groups of rock that makes up the crust of the Earth; formed by the cooling of molten rock, either below the surface (intrusive) or on the surface (extrusive)

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

  • noun rock formed by the solidification of molten magma

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