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

 

obsidian

 noun
noun
BrE BrE//əbˈsɪdiən//
 
; NAmE NAmE//əbˈsɪdiən//
 
[uncountable]
 
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a type of dark rock that looks like glass and comes from volcanoes Word Origin mid 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