Definition of igneous adjective from the Oxford Advanced American Dictionary

 

igneous

 adjective
adjective
NAmE//ˈɪɡniəs//
 
(geology)
 
jump to other results
(of rocks) formed when magma (= melted or liquid material lying below the earth's surface) becomes solid, especially after it has poured out of a volcano
See the Oxford Advanced Learner's Dictionary entry: igneous