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isohyetal
isohyetal adj. (and n.) 
/ˌaɪsoʊˈhaɪəd(ə)l/ [Greek ὑετός rain] = isohyetose adj.
Brit. /ˌʌɪsə(ʊ)ˈhʌɪᵻtl/
, /ˌʌɪsə(ʊ)ˈhʌɪᵻtl/U.S. /ˌaɪsəˈhaɪəd(ə)l/
, /ˌaɪsəˈhaɪəd(ə)l//ˌaɪsoʊˈhaɪəd(ə)l/ΘΚΠ
the world > the earth > weather and the atmosphere > weather > study or science of weather > diagrams, graphs, or lines > [noun] > rainfall
rain map1848
rain chart1849
isohyetal1889
isohyet1899
the world > the earth > weather and the atmosphere > weather > study or science of weather > diagrams, graphs, or lines > [adjective] > rainfall
isohyetal1889
1889 Cent. Dict. Isohyetal, a. and n.
1895 T. Russell Meteorol. vii. 141 A graphic representation of quantity of rainfall by lines through places having equal depths of rainfall are ‘isohyetals’.
1909 British Rainfall 1908 140 The isohyetal lines are drawn about the 18th of the following month.
1923 Glasgow Herald 1 Feb. 6 Most of these features are..illustrated by maps exhibiting them..by isohyetal lines.
1962 W. Stegner Wolf Willow iv. iv. 281 She knew nothing about minimal annual rainfall, distribution of precipitation, isohyetal lines.
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