Etymology
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obsidian (n.)

"dark, hard, glass-like volcanic rock," 1650s, from Latin obsidianus, misprint of Obsianus (lapis) "(stone) of Obsius," name of a Roman alleged by Pliny to have found this rock in Ethiopia.

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Definitions of obsidian

obsidian (n.)
acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces;
From wordnet.princeton.edu