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Adjective: extrusive  ik'stroo-siv or ek'stroo-siv
  1. (geology) of rock material; forced out while molten through cracks in the earth's surface
    "Extrusive and intrusive igneous rocks can generally be distinguished by their texture and mineral composition"

See also: volcanic

Antonym: intrusive

Encyclopedia: Extrusive

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extrospective
extroversion
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extrusive
extubation
exuberance
exuberant
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exudate
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exultant