One of the mysteries of the English language finally explained.
A line or surface on a diagram connecting points representing those in the interior of the earth having the same temperature.
- ‘It is a well-known fact that the presence of water in the pores of a rock increases its capacity to conduct heat, so that we may surmise a rise in the local isogeotherm in such situations.’
Mid 19th century: from iso- ‘equal’ + geo- ‘earth’ + Greek thermē ‘heat’.
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