obsidian: Meaning and Definition of

ob•sid•i•an

Pronunciation: (ub-sid'ē-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.
See also:
obsessive-compulsive obsidian dating
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