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thermochromism

noun
ther·​mo·​chro·​mism | \ˈthərməˌkrōˌmizəm\

Definition of thermochromism 

: the phenomenon of reversible change of color of a substance with change of temperature (as the change of mercuric oxide from nearly colorless on being cooled by liquid air to red at room temperature and to black on being heated)

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History and Etymology for thermochromism

therm- + chrom- + -ism

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