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isogeotherm Phys. Geog.|aɪsəʊˈdʒiːəʊθɜːm|
[f. iso- + Gr. γεω- earth + θέρµη heat, θερµός hot: cf. geothermic, etc.]
A line or surface (usually imaginary) connecting points in the interior of the earth having the same temperature; an isogeothermal line.
1864in Webster. 1877Le Conte Elem. Geol. ii. (1879) 78 If the rate of increase were everywhere the same, the isogeotherms would be everywhere concentric. 1881Judd Volcanoes xii. 359 The isogeotherms, or lines indicating the depths at which the same mean temperature is found within the earth's crust.
Hence isogeoˈthermal, isogeoˈthermic adjs., of the nature of an isogeotherm; indicating equal temperatures in the interior of the earth.
1832H. T. De la Beche Geol. Man. (ed. 2) 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. 1834M. Somerville Connex. Phys. Sc. xxvi. (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. |