— eruptional , adj.
/i rup"sheuhn/ , n.
1. an issuing forth suddenly and violently; outburst; outbreak.
2. Geol. the ejection of molten rock, steam, etc., as from a volcano or geyser.
3. something that is erupted or ejected, as molten rock, volcanic ash, or steam.
4. Pathol.
a. the breaking out of a rash or the like.
b. a rash or exanthem.
[ 1375-1425; late ME eruption- (s. of eruptio ). See ERUPT, -ION ]