vitreousrock
nounUK /ˈvɪtriəs rɒk/
US /ˈvɪtriəs rɑːk/
A kind of rock that looks shiny and smooth like glass.
The hiker picked up a piece of vitreousrock that sparkled in the sun.
RELATED WORDS
OTHER MEANINGS
2. A rock formed when hot lava cools very fast, giving it a glassy surface.
Scientists studied the vitreousrock to learn how quickly the volcano's lava cooled.
3. Any stone with a smooth, glass-like shine used in jewelry or decoration.
She wore a necklace made of polished vitreousrock.
4. A type of rock that breaks with sharp, curved edges like broken glass.
The vitreousrock shattered into sharp pieces when it hit the ground.