geothermometer

== English == === Etymology === From geo- +‎ thermometer. === Noun === geothermometer (plural geothermometers) (geology) A proxy that allows for geothermometry, the determination of the temperature of a geological material from the past or existing at great depth. (obsolete) A thermometer designed for measuring extremely high temperatures below ground level. ==== Related terms ==== geothermometric geothermometry === References === “geothermometer”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.