| volcanic | (adjective) relating to or produced by or consisting of volcanoes | - |
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| (adjective) igneous rock produced by eruption and solidified on or near the earth's surface; rhyolite or andesite or basalt | - |
| (adjective) explosively unstable | - |
| volcanically | (adverb) by or like volcanoes | - |
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| volcanism | (noun) the phenomena associated with volcanic activity | - |
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| volcano | (noun) a mountain formed by volcanic material | - |
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| (noun) a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt | Synonyms: vent |
| volcanology | (noun) the branch of geology that studies volcanoes | Synonyms: vulcanology |
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