volcanic (Adjective) — Relating to or produced by or consisting of volcanoes. ex. "volcanic steam" ex. "volcanic islands such as Iceland" ex. "a volcanic cone is a conical mountain or hill built up of material from volcanic eruptions"
volcanic (Adjective) — Explosively unstable. ex. "a volcanic temper"
volcanic (Adjective) — (geology) having igneous rock produced by eruption and that solidified on or near the earth's surface. ex. "volcanic rock includes the volcanic glass obsidian"