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ob·sid·i·an   /əbˈsɪdiən/

ob·sid·i·an   /əbˈsɪdiən/ Show Spelled
[uhb-sid-ee-uhn] Show IPA

–noun
a volcanic glass similar in composition to granite, usually dark but transparent in thin pieces, and having a good conchoidal fracture.
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Origin:
1350–1400; < Latin Obsidiānus, printer's error for Obsiānus pertaining to Obsius, the discoverer (according to Pliny) of a similar mineral in Ethiopia; replacing Middle English obsianus < Latin; see -anDictionary.com Unabridged

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