adjective. ['ˌkætəˈklɪzmɪk'] severely destructive.
1. Adjective However, it would take a cataclysmic event to give a pool a pH of 0.
1. Only by showing the world the cataclysmic cost of a world divided can it appreciate the wonders of life and endless possibilities of a world united. - William Bailey, Great Ship of Knowledge: Learning Earth's Deathly History
