obsidian - WordReference.com Dictionary of English

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obsidian

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Concise Oxford English Dictionary © 2008 Oxford University Press:
obsidian /əbˈsɪdɪən/

▶noun a hard, dark, glass-like volcanic rock formed by the rapid solidification of lava without crystallization.

– origin C17: from L. obsidianus, error for obsianus, from Obsius, the name (in Pliny) of the discoverer of a similar stone.

'obsidian' also found in these Oxford entries:

perlite - pitchstone - volcanic glass

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