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Answer for the clue "A pyrometer that uses the color of the light emitted by a hot object ", 9 letters:
pyroscope

Word definitions for pyroscope in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Pyroscope \Pyr"o*scope\, n. [Pyro- + -scope: cf. F. pyroscope.] (Physics) An instrument for measuring the intensity of heat radiating from a fire, or the cooling influence of bodies. It is a differential thermometer, having one bulb coated with gold or ...

Wiktionary Word definitions in Wiktionary
n. (context dated physics English) an early form of pyrometer

WordNet Word definitions in WordNet
n. a pyrometer that uses the color of the light emitted by a hot object [syn: optical pyrometer ]