<p><strong>Noun</strong></p><ul><li>An issuing forth suddenly and violently; outburst; outbreak.</li><li>Geology: the ejection of molten rock, steam, etc., as from a volcano or geyser.</li><li>Something that is erupted or ejected, as molten rock, volcanic ash, or steam.</li><li>Pathology: the breaking out of a rash or the like.</li><li>A rash or exanthem.</li></ul>