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isoneph
isoneph n.
Brit. 
/ˈʌɪsə(ʊ)nɛf/
, /ˈʌɪsə(ʊ)nɛf/U.S. /ˈaɪsəˌnɛf/
[Greek νέϕος cloud] a line on a map, etc. connecting places at which the amount of cloud for a given period (e.g. a year) is the same./ˈaɪsəˌnɛf/ΘΚΠ
the world > the earth > weather and the atmosphere > weather > study or science of weather > diagrams, graphs, or lines > [noun] > cloud
isoneph1880
1880 Eng. Mechanic 24 Sept. 51/3 By tracing on the surface of the globe lines of equal nebulosity, M. Renou gets what he calls isonephs.
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