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isoline
isoline n. 
/ˈaɪsoʊˌlaɪn/ = isopleth n. 1.
Brit. /ˈʌɪsə(ʊ)lʌɪn/
, /ˈʌɪsə(ʊ)lʌɪn/U.S. /ˈaɪsəˌlaɪn/
, /ˈaɪsəˌlaɪn//ˈaɪsoʊˌlaɪn/ΘΠ
society > communication > representation > a plastic or graphic representation > graphic representation > drawing lines > [noun] > line connecting points of same value
isogram1889
isopleth1909
isoline1944
1944 V. Conrad Methods in Climatol. xiii. 167 Isolines..are fully analogous to contour lines, or to the equipotential lines used in physics... Closed isolines surrounding a region indicate that this is either depressed or elevated.
1961 G. T. Trewartha Earth's Probl. Climates xvi. 237/2 In summer..the isolines of rainfall frequency show a strong zonal arrangement.
1969 Nature 29 Nov. 903/1 Vertical sections show that isolines slope steeply to the surface [of the sea] during upwelling, but the slope of the isoline varies with the parameter chosen.
1970 Biol. Abstr. 51 11534/1 The resulting pattern of the isolines can be readily related to the distribution of a particular organism.
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