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A natural glass produced by the cooling of molten lava, or a liquid fraction of it, too rapidly to permit crystallization.
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
a kind of natural glass produced when molten lava cools very rapidly
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Broader terms: volcanic rock
Narrower terms: obsidian, pitchstone, tachylite
No etymology was provided for this word.