Emily Dickinson Lexicon

VOL-CA'NO, n. [It. from Vulcan.]

1. In geology, an opening in the surface of the earth or in a mountain, from which smoke, flames, stones, lava, or other substances are ejected. Such are seen in Etna and Vesuvius in Sicily and Italy, and Hecla in Iceland. It is vulgarly called a burning mountain. Herschel has discovered a volcano in the moon.
2. The mountain that ejects fire, smoke, &c.