extrusive

adjective
ex·​tru·​sive | \ ik-ˈstrü-siv How to pronounce extrusive (audio) , -ziv\

Definition of extrusive

: relating to or formed by geological extrusion from the earth in a molten state or as volcanic ash

First Known Use of extrusive

1816, in the meaning defined above

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The first known use of extrusive was in 1816

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