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| ob·sid·i·an [ əb síddee ən, ob síddee ən ] (plural ob·sid·i·ans) |
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| Definition: |
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jet-black volcanic glass: a jet-black volcanic glass, chemically similar to granite and formed by the rapid cooling of molten lava, that was used by early civilizations for manufacturing tools and ceremonial objects
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| [14th century. < Latin (lapis) Obsidianus, copyist's error for Obsianus "(stone) of Obsius," a Roman] |
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