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obsidian: Meaning and Definition of

ob•sid•i•an

Pronunciation: (ub-sid'?-un), [key]
? n.
  1. a volcanic glass similar in composition to granite, usually dark but transparent in thin pieces, and having a good conchoidal fracture.
Random House Unabridged Dictionary, Copyright 1997, by Random House, Inc., on Infoplease.
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