Definition of basalt noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈbæsɔːlt//
; NAmE NAmE//bəˈsɔːlt//
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a type of dark rock that comes from volcanoes Word Origin early 17th cent. (in the Latin form): from Latin basaltes (variant of basanites), from Greek basanitēs, from basanos ‘touchstone’.
See the Oxford Advanced American Dictionary entry: basalt