(ˈhaɪɪtəˌɡrɑːf; -ˌɡræf) n1. (Physical Geography) a chart showing the distribution of rainfall of a particular area, usually throughout a year2. (Physical Geography) a self-recording rain gauge
hyetograph
hyetograph
[hī′ed·ə‚graf] (climatology) A map or chart displaying temporal or areal distribution of precipitation.