volˈcanian,a.rare. [f. volcan-o n. + -ian. Cf. vulcanian a.] Of or pertaining to, resembling that of, a volcano. 1820Keats Lamia i. 155 A deep volcanian yellow took the place Of all her milder-mooned body's grace.1869J. Phillips Vesuv. viii. 203 This safety-valve for the volcanian pressure.