geothermn.
/ˈdʒiːə(ʊ)θəːm/, U.S. /ˈdʒioʊˌθərm/ Geology.
Originally: = isogeotherm n. Now usually: a graph of temperature as a function of depth in the earth's crust; a geothermal gradient.
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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
1908 J. Joly in Science 27 Nov. 737/2 The estimated depth of this geotherm is, on the assumptions, about 40 kilometers.
1925 J. Joly Surface-hist. Earth 191 Geotherm, or isogeotherm, an imaginary plane beneath the surface of the earth at every point of which the temperature is the same.
1948 Jrnl. Geol. (Chicago) 56 116/2 The metasomatic replacement of the limestones..and the formation of chert seem to be promoted by the rise of the geotherms accompanying geosynclinal downwarp.
1971 I. G. Gass et al. Understanding Earth v. 86/1 The geotherm (temperature versus depth within the Earth) is a function of surface temperature and surface heat flow.
2008 Jrnl. Geol. Soc. 165 31 From the computed geotherms and lithological parameters, we calculate yield stress and then integrate over depth to compute the total strength of the lithosphere at the two locations.
This is a new entry (OED Third Edition, March 2012; most recently modified version published online March 2022).
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n.1908