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thermoscope

The definition of a thermoscope is an instrument that shows changes in the temperature of a substance by noting changes in the volume of the substance.

(noun)

An example of a thermoscope is a tool for measuring the temperature of water by seeing how the water's volume decreases and increases.
An example of a thermoscope is a thermometer without a numerical scale.

See thermoscope in Webster's New World College Dictionary

noun

an instrument for indicating changes in temperature of a substance, without accurately measuring them, by observing the accompanying changes in volume

Origin: thermo- + -scope

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