pyrometer

noun

Etymology: Etymology tree Proto-Indo-European *péh₂wr̥ Proto-Hellenic *pāwər Ancient Greek πῦρ (pûr) Latin pyr English pyro- Proto-Indo-European *meh₁- Proto-Indo-European *-tḗr Proto-Indo-European *-trom Proto-Hellenic *-tron Ancient Greek -τρον (-tron) Ancient Greek μέτρον (métron)der. English -meter English pyrometer From pyro- + -meter.

1. A thermometer designed to measure high temperatures.

   “I was working with full regulator and about 40 per cent cut-off and we were going quite hard when André called my attention to the pyrometer. This was showing a comparatively low temperature (about 250 deg C.) which meant that unless I eased up, the boiler might start to prime. So we eased her a shade, let the water come down to a third of a glass and then we were away again in perfect order with the pyrometer showing about 375 deg C.”

2. An instrument for measuring the thermal expansion of solids.