volcanic glass
noun
a natural glass produced when molten lava cools very rapidly; obsidian.
Origin of volcanic glass
First recorded in 1830–40
Words nearby volcanic glass
volcanic,
volcanic arc,
volcanic ash,
volcanic bomb,
volcanic cone,
volcanic glass,
volcanic neck,
volcanic pipe,
volcanic tuff,
volcaniclastic,
volcanism
Example sentences from the Web for volcanic glass
She armed herself with an obsidian or volcanic-glass knife, and waited their coming.
Legends of Ma-ui--a demi god of Polynesia, and of his mother Hina |W. D. Westervelt
British Dictionary definitions for volcanic glass
volcanic glass
noun
any of several glassy volcanic igneous rocks, such as obsidian and pitchstone
Scientific definitions for volcanic glass
volcanic glass
Natural glass produced by the cooling of molten lava too quickly to permit crystallization. Obsidian is a type of volcanic glass.