volcanic

If something is volcanic, it's violently explosive, like the volcanic eruption from a mountain or a two-year-old's volcanic temper tantrum after skipping his afternoon nap.

Use this adjective to describe anything related to volcanoes, like volcanic ash and rock left behind after a volcanic eruption, or the volcanic activity picked up by a scientist's equipment. It's also a great way to talk about emotions that are (figuratively, at least) as volatile as a volcano. If your sister's mood is volcanic, you'll want to steer clear of her. The source of both volcanic and volcano is the Roman god of fire, Vulcan.

Definitions of volcanic
  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
    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”
    Synonyms:
    extrusive
    of rock material; forced out while molten through cracks in the earth's surface
  3. adjective
    explosively unstable
    “a volcanic temper”
    Synonyms:
    unstable
    lacking stability or fixity or firmness
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