noun Meteorology.
a line drawn on a map connecting points having equal rainfall at a certain time or for a stated period.

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

isohyetal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
isohyet (ˌaɪsəʊˈhaɪɪt)
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Compute the area between successive isohyetal lines and multiply by the average of the isohyet values.
The track itself is roughly parallel to the two inch isohyet.
Interpolation between isohyets was used when the site did not fall exactly on a particular isohyet.
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