geothermometer

Noun

 * 1)  A proxy that allows for geothermometry, the determination of the temperature of a geological material from the past or existing at great depth.
 * 2)  A thermometer designed for measuring extremely high temperatures below ground level.
 * 1)  A thermometer designed for measuring extremely high temperatures below ground level.
 * 1)  A thermometer designed for measuring extremely high temperatures below ground level.
 * 1)  A thermometer designed for measuring extremely high temperatures below ground level.