Definition of extrusive in English:

extrusive

Syllabification: ex·tru·sive
Pronunciation: /ikˈstro͞osiv
 
/

adjective

Geology
Relating to or denoting rock that has been extruded at the earth’s surface as lava or other volcanic deposits.
More example sentences
  • In practice pyroclastic and volcaniclastic rocks include all the products of extrusive volcanic activity except lava flows.
  • The northern margin of the melange is marked by a thrust contact with both the Carboniferous sedimentary rocks and extrusive volcanic sequence.
  • Although there are no outcrops of Devonian extrusive volcanic rocks in NW Scotland, they can be found in southern and central Scotland and the Orkney Islands.

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal