What does extrusive mean?

Looking for the meaning or definition of the word extrusive? Here's what it means.

Adjective
  1. Jutting out; extruding.
  2. (geology) of rocks: forced, while in a plastic or molten state, on to the earth's surface to lie atop of existing rocks.
Noun
  1. (geology) Rock which has been formed through volcanic extrusion.
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