isogeothermn.
/ʌɪsəʊˈdʒiːəʊθəːm/ Physical Geography.
A line or surface (usually imaginary) connecting points in the interior of the earth having the same temperature; an isogeothermal line.
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the world > matter > properties of materials > temperature > [noun] > isothermal line or surface > connecting points in earth's interior
isogeotherm1864
geothermal1895
geotherm1908
1864 in Webster's Amer. Dict. Eng. Lang.
1877 J. Le Conte Elements Geol. (1879) ii. 78 If the rate of increase were everywhere the same, the isogeotherms would be everywhere concentric.
1881 J. W. Judd Volcanoes xii. 359 The isogeotherms, or lines indicating the depths at which the same mean temperature is found within the earth's crust.
Derivatives
isogeoˈthermal adj.
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the world > matter > properties of materials > temperature > [adjective] > lines or surfaces of equal temperature > in earth's interior
isogeothermal1831
1831 H. T. De la Beche Geol. Man. i. 15 If we draw lines through all the points which have the same terrestrial temperature, these isogeothermal lines resemble the isothermal, as they are parallel to the equator, but diverge from it in several points.
1834 M. Somerville On Connexion Physical Sci. (1849) 289 Lines drawn through all those points in the upper strata of the globe which have the same mean annual temperature..are isogeothermal lines.
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isogeoˈthermic adj. of the nature of an isogeotherm; indicating equal temperatures in the interior of the earth.
This entry has not yet been fully updated (first published 1900; most recently modified version published online June 2021).
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n.1831