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

  • adj. Tending to push or thrust out.
  • adj. Tending to protrude or project.
  • adj. Derived from magma poured out or ejected at the earth's surface. Used of igneous rocks.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Jutting out; extruding.
  • n. Rock which has been formed through volcanic extrusion.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Forced out at the surface; ; -- contrasted with intrusive.

from The Century Dictionary and Cyclopedia

  • Capable of being extruded or thrust out; that tends or serves to extrude or thrust out or forth; specifically, in petrography, erupted or extruded: applied to igneous rocks. Same as effusive.
  • n. That which is extruded; specifically, in petrography, same as effusive (which see): contrasted with intrusive.

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

  • adj. of rock material; forced out while molten through cracks in the earth's surface


Sorry, no etymologies found.



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