a hard, usually dark-colored or black volcanic glass with conchoidal fracture, often used as a gem
Origin of obsidianModern Latin obsidianus ; from Classical Latin Obsidianus (lapis), a faulty reading in Pliny (altered by associated, association with Classical Latin obsidium, a siege ; from obsidere: see obsess) for Obsianus (lapis), stone of Obsius, finder of a similar stone in Ethiopia
A usually black or banded, hard volcanic glass that displays shiny, curved surfaces when fractured and is formed by rapid cooling of lava.
Origin of obsidianLatin obsidi&amacron;nus, misreading of obsi&amacron;nus (lapis), Obsian (stone), obsidian, after Obsius, a Roman who supposedly discovered it or a similar mineral.
(usually uncountable, plural obsidians)
(comparative more obsidian, superlative most obsidian)
- (poetic) black