extrusive

Definitions of extrusive
  1. adjective
    of rock material; forced out while molten through cracks in the earth's surface
    synonyms:
    volcanic
    igneous rock produced by eruption and solidified on or near the earth's surface; rhyolite or andesite or basalt
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    antonyms:
    intrusive
    of rock material; forced while molten into cracks between layers of other rock
    irruptive, plutonic
    of igneous rock that has solidified beneath the earth's surface; granite or diorite or gabbro
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