What is Eruption?

Eruption definition and meaning on Dictionary terms:

an issuing forth suddenly and violently; outburst; outbreak.
Geology. the ejection of molten rock, steam, etc., as from a volcano or geyser.
something that is erupted or ejected, as molten rock, volcanic ash, or steam.

  1. the breaking out of a rash or the like.
  2. a rash or exanthem.