Is “Isohyet” a Scrabble word?
Yes
ISOHYET
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Isohyet
/ˈaɪ.soʊˌhaɪ.ɪt/
noun
1.A line of equal or constant rainfall on a graph or chart, such as a weather map.