|1.||[ adjective ] 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"
|2.||[ adjective ] explosively unstable|
"a volcanic temper"
|3.||[ adjective ] (geology) 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"