[iso.hy.et] n [ISV is- + Gk hyetos rain, fr. hyein to rain; prob. akin to Toch B swese rain] (1899): a line on a map or chart connecting areas of equal rainfall -- iso.hy.et.al adj
ISOHYET
Meaning of ISOHYET in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012