natural disasternoun [ C ]
uk/ˌnætʃ.ər.əl dɪˈzɑː.stər//ˌnætʃ.ɚ.əl dɪˈzæs.tɚ/a natural event such as a flood, earthquake, or tsunami that kills or injures a lot of people:
Europe's 2003 heat wave claimed more than 30,000 lives, making it the continent's largest natural disaster in 50 years.