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1. (n.) obsidian
a volcanic glass similar in composition to granite, usu. dark but transparent in thin pieces, and having a good conchoidal fracture.
Etymology: (1790–1800; < L Obsidiānus, printer's error for Obsiānus pertaining to Obsius, the discoverer (according to Pliny) of a similar mineral in Ethiopia; cf. ME obsianus < L; see -an1)
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| Definition of 'obsidian' |
Princeton's WordNet |
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1. (noun) obsidian
acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces
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| Definition of 'obsidian' |
Webster Dictionary |
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1. (noun) obsidian
a kind of glass produced by volcanoes. It is usually of a black color, and opaque, except in thin splinters
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| Definitions of 'obsidian' |
The Nuttall Encyclopedia |
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1. obsidian
a hard, dark-coloured rock of a glassy structure found in lava, which breaks with conchoidal fracture.
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Definitions of obsidian 
