pyrometer noun. [pʌɪ'rɒmɪtǝ] M18.
[from PYRO- + -METER.]
Orig., an instrument for measuring the expansion of solid bodies under the influence of heat. Now, any instrument for measuring high temperatures, usu. those higher than can be measured by a mercury thermometer.
optical pyrometer: see OPTICAL adjective.

■ pyrometry noun the measurement of very high temperatures (using a pyrometer) L18.

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