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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

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

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

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 ...