[hahy-et-uh-graf, -grahf, hahy-i-tuh-]
- a map or chart showing the average rainfall for the localities represented.
Origin of hyetograph
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a chart showing the distribution of rainfall of a particular area, usually throughout a year
- a self-recording rain gauge
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012