Home › Words › H › hyetographhyetograph/haɪˈɛtəɡɹæf/hyetograph means A graphical representation of rainfall over time.hyetograph is pronounced /haɪˈɛtəɡɹæf/.EtymologyFrom hyeto- + -graph.nounA graphical representation of rainfall over time.Definitions & examples from Wiktionary (CC BY-SA 3.0).