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