First Known Use: 1796
Dictionary
obsidian
noun ob·sid·i·an \əb-ˈsi-dē-ən\
: a dark natural glass that forms when lava cools
Full Definition of OBSIDIAN
: a dark natural glass formed by the cooling of molten lava
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Origin of OBSIDIAN
New Latin obsidianus, from Latin obsidianus lapis, false manuscript reading for obsianus lapis, literally, stone of Obsius, from Obsius, its supposed discoverer
OBSIDIAN Defined for Kids
obsidian
noun ob·sid·i·an \əb-ˈsi-dē-ən\
Definition of OBSIDIAN for Kids
: a smooth dark rock formed by the cooling of lava
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