(adj.) igneous rock produced by eruption and solidified on or near the earth's surface; rhyolite or andesite or basalt; 'volcanic rock includes the volcanic glass obsidian' .
(adj.) explosively unstable; 'a volcanic temper' .
(adj.) relating to or produced by or consisting of volcanoes; 'volcanic steam'; 'volcanic islands such as Iceland'; 'a volcanic cone is a conical mountain or hill built up of material from volcanic eruptions' .
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