isotheraladj.n.
/ʌɪˈsɒθərəl//ˈʌɪsəʊθɪərəl/ A. adj.
Applied to lines on a map, etc. connecting places having the same mean summer temperature.
ΘΚΠ
the world > the earth > weather and the atmosphere > weather > study or science of weather > diagrams, graphs, or lines > [adjective] > temperature > summer or winter
isocheimal1839
isotheral1839
isocrymal1852
isochimenal1863
isocheimonal1864
1839 Penny Cycl. XV. 139/2 The names of Isotheral, Isocheimal, and Isothermal lines have been given to lines passing through places which have equal mean summer, winter, or annual temperatures.
1852 J. D. Dana U.S. Exploring Exped.: Crustacea Pt. II ii. 1452 There are several reasons why isocrymal are preferable to isotheral lines.
1874 J. Geikie Great Ice Age xxx. 459 The charts of isotheral and isochimenal lines.
B. n.
An isotheral line, an isotherm of mean summer temperature.
ΘΚΠ
the world > the earth > weather and the atmosphere > weather > study or science of weather > diagrams, graphs, or lines > [noun] > climatic differences > temperature > in summer or winter
isochimenal1846
isocrymal1852
isocryme1852
isothere1852
isocheim1864
isotheral1867
1867 Proctor in Intellectual Observer No. 62. 118 The isotheral of London.
This entry has not yet been fully updated (first published 1900; most recently modified version published online March 2018).
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adj.n.1839