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ex·tru·sive | \ ik-ˈstrü-siv 
, -ziv \
, -ziv \Definition of extrusive
: relating to or formed by geological extrusion from the earth in a molten state or as volcanic ash
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Merriam-Webster unabridgedWords at Play
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Time Traveler for extrusive
The first known use of extrusive was in 1816
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