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



BrE BrE//ˈɪɡniəs//
; NAmE NAmE//ˈɪɡniəs//
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(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 Word Originmid 17th cent.: from Latin igneus (from ignis ‘fire’) + -ous.
See the Oxford Advanced American Dictionary entry: igneous