Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. Natural glass produced by the cooling of molten lava too quickly to permit crystallization.
GNU Webster's 1913
- adj. the vitreous form of lava, produced by sudden cooling; obsidian. See Obsidian.
WordNet 3.0
- n. a kind of natural glass produced when molten lava cools very rapidly
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