A tendency toward eruption.
1830. There were two volcanoes ‘in blast’ during our stay here, or rather they kept up a continual smoke, which indicated eruptiveness.—N. Ames, ‘A Mariner’s Sketches,’ p. 134. (Italics in the original.)
1885. They create by stoppage a volcano, and are amazed at its eruptiveness.—G. Meredith, ‘Diana of the Crossways,’ i. 19. (N.E.D.)
