- of or relating to rain or rainfall.
Origin of hyetal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- of or relating to rain, rainfall, or rainy regions
C19: from Greek huetos rain + -al 1
- Relating to rain or rainy regions, used especially in regard to isohyetal rainfall maps.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.