Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Latin
Origin: obsidianus lapis, mistake for obsianus lapis 'stone of Obsius', a Roman traveler said to have discovered the rock

obsidian

 noun
     
obsidian
ob‧sid‧i‧an [uncountable]
a type of rock that looks like black glass
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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