Definition of extrusive adjective from the Oxford Advanced Learner's Dictionary

 

extrusive

 adjective
adjective
BrE BrE//ɪkˈstruːsɪv//
 
; NAmE NAmE//ɪkˈstruːsɪv//
 
(geology)
 
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(of rock) that has been pushed out of the earth by a volcano
See the Oxford Advanced American Dictionary entry: extrusive