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



BrE BrE//əbˈsɪdiən//
; NAmE NAmE//əbˈsɪdiən//
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a type of dark rock that looks like glass and comes from volcanoes Word Originmid 17th cent.: from Latin obsidianus, error for obsianus, from Obsius, the name of the discoverer of a similar stone.
See the Oxford Advanced American Dictionary entry: obsidian