Definition of obsidian
: a dark natural glass formed by the cooling of molten lava
Recent Examples of obsidian from the Web
Known as obsidian in the real world, dragonglass kills white walkers and also creates them if stabbed into a human heart by the Children of the Forest.
A few of the victims were bound before death, and some have arrowheads of stone and obsidian embedded in their bones.
Drops of scarlet blood on a hard tarmac black as obsidian.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'obsidian.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of obsidian
New Latin obsidianus, from Latin obsidianus lapis, false manuscript reading for obsianus lapis, literally, stone of Obsius, from Obsius, its supposed discoverer
First Known Use: 1794See Words from the same year
OBSIDIAN Defined for English Language Learners
Definition of obsidian for English Language Learners
: a dark natural glass that forms when lava cools
OBSIDIAN Defined for Kids
Definition of obsidian for Students
: a smooth dark rock formed by the cooling of lava
Seen and Heard
What made you want to look up obsidian? Please tell us where you read or heard it (including the quote, if possible).