volcanic rock
English Thesaurus
1. extrusive igneous rock solidified near or on the surface of the Earth (noun.substance)
| hypernym | : | igneous rock, |
| definition | : | rock formed by the solidification of molten magma (noun.substance) |
| hyponym | : | agglomerate, |
| definition | : | volcanic rock consisting of large fragments fused together (noun.substance) |
| hyponym | : | amygdaloid, |
| definition | : | volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits (noun.substance) |
| hyponym | : | dacite, |
| definition | : | a grey volcanic rock containing plagioclase and quartz and other crystalline minerals (noun.substance) |
| hyponym | : | basalt, |
| definition | : | the commonest type of solidified lava; a dense dark grey fine-grained igneous rock that is composed chiefly of plagioclase feldspar and pyroxene (noun.substance) |
| hyponym | : | volcanic glass, |
| definition | : | a kind of natural glass produced when molten lava cools very rapidly (noun.substance) |
| hyponym | : | lava, |
| definition | : | rock that in its molten form (as magma) issues from volcanos; lava is what magma is called when it reaches the surface (noun.substance) |
| hyponym | : | tufa, tuff, |
| definition | : | hard volcanic rock composed of compacted volcanic ash (noun.substance) |
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