obsidian[əb sid′ē ən]
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 obsidiānus, misreading of obsiānus (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