The Collaborative International Dictionary
Isohyetose
Isohyetose \I`so*hy"e*tose`\, a. [Iso- + Gr. "yeto`s rain.] (Phys. Geog.) Of or pertaining to lines connecting places on the earth's surface which have the same mean annual rainfall. -- n. An isohyetose line; called also isohyet.
Wiktionary
isohyetose
a. isohyetal n. An isohyet.