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obsidian

noun
/əbˈsɪdiən/
/əbˈsɪdiən/
[uncountable]
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  1. a type of dark rock that looks like glass and comes from volcanoes黑曜岩;黑曜石
    Word Originmid 17th cent.: from Latin obsidianus, error for obsianus, from Obsius, the name of the discoverer of a similar stone.

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