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obsidian obsidian
/ Cb5sIdi:En /

◙ noun
1. [mass noun] a hard, dark, glass-like volcanic rock formed by the rapid solidification of lava without crystallization
• 黑曜岩

1. mid 17th cent.: from Latin obsidianus, error for obsianus, from Obsius, the name (in Pliny) of the discoverer of a similar stone