isohyetal

isohyet

[ahy-suh-hahy-uht]
noun Meteorology.
a line drawn on a map connecting points having equal rainfall at a certain time or for a stated period.

Origin:
1895–1900; iso- + -hyet < Greek hyetós rain

isohyetal, adjective
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World English Dictionary
isohyet (ˌaɪsəʊˈhaɪɪt)
 
n
a line on a map connecting places having equal rainfall
 
[C19: from iso- + -hyet, from Greek huetos rain]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
isohyet   (ī'sō-hī'ĭt)  Pronunciation Key 
A line drawn on a weather map connecting points that receive equal amounts of precipitation during a given period of time.
The American Heritage® Science Dictionary
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