rare. [f. VOLCANO sb. + -ISM.] The action of a volcano; eruption.
1843. Carlyle, Past & Pr., II. x. Not blaze out, or the seldomest possible blaze out, as wasteful volcanoism to scorch and consume!
1866. Burlington Times, 24 March, 2/2. A cordilleristic volcanoism of cotopaistic lava courses wildly through his red-hot æsophagus.
