Thesaurus: obsidian

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Definitions

1. n. A kind of glass produced by volcanoes. It is usually of a black color, and opaque, except in thin splinters.
2. n. acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces
3. A kind of glass produced by volcanoes. It is usually of a black color, and opaque, except in thin splinters. Note: In a thin section it often exhibits a fluidal structure, marked by the arrangement of microlites in the lines of the flow of the molten mass.
4. A kind of glass produced by volcanoes. It is usually of a blackcolor, and opaque, except in thin splinters.
5. n:100 n. acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces