| NOUN | substance | volcanic glass | a kind of natural glass produced when molten lava cools very rapidly |
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| Meaning | A kind of natural glass produced when molten lava cools very rapidly. | |
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| Narrower | obsidian | acid or granitic glass formed by the rapid cooling of lava without crystallization |
| pitchstone | dark acid granitic glass | |
| tachylite | A basic or basalt glass | |
| Broader | volcanic rock | extrusive igneous rock solidified near or on the surface of the Earth |
| Spanish | roca volcánica vítrea | |
| Catalan | roca volcànica vítria, vidre volcànic | |
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