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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Pyrometer \Py*rom"e*ter\, noun [Pyro- + -meter: cf. F. pyrom['e]tre.]
1. (Physics) An instrument used for measuring the expansion of solid bodies by heat.
2. (Physics) An instrument for measuring degrees of heat above those indicated by the mercurial thermometer.
Note: It is usually constructed so as to register the change which the heat to be measured produces in the length of some expansible substance, as a metallic rod, or in the intensity of a thermo-electric current.
From WordNet (r) 2.0 [wn]:
pyrometer
noun: a thermometer designed to measure high temperatures
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