Etymology
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extrusive (adj.)

"of or pertaining to extrusion or that which has been extruded," especially in geology, of rock that has been thrust out of the earth by volcanic activity, 1816, from Latin extrus-, past-participle stem of extrudere "thrust out; drive away" (see extrusion) + -ive. Related: Extrusively.

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Definitions of extrusive

extrusive (adj.)
of rock material; forced out while molten through cracks in the earth's surface;
From wordnet.princeton.edu