n.
Pronunciation: ˌ ī -s ō - ' h ī - ə t
Function: noun
Etymology: International Scientific Vocabulary is- + Greek hyetos rain, from hyein to rain; probably akin to Tocharian B swese rain
Date: 1899
: a line on a map or chart connecting areas of equal rainfall
– iso · hy · et · al \ - ə -t ə l \ adjective