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obsidian

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noun ob·sid·i·an \əb-ˈsi-dē-ən\

Simple Definition of obsidian

  • : a dark natural glass that forms when lava cools

Source: Merriam-Webster's Learner's Dictionary

Full Definition of obsidian

  1. :  a dark natural glass formed by the cooling of molten lava

Origin and Etymology of obsidian

New Latin obsidianus, from Latin obsidianus lapis, false manuscript reading for obsianus lapis, literally, stone of Obsius, from Obsius, its supposed discoverer


First Known Use: 1796


OBSIDIAN Defined for Kids

obsidian

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noun ob·sid·i·an \əb-ˈsi-dē-ən\

Definition of obsidian for Students

  1. :  a smooth dark rock formed by the cooling of lava




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