Decalescence meaning

dē'kə-lĕs'əns
A sudden slowing in the rate of temperature increase in a metal being heated, caused by endothermic structural changes and resulting in a darkening of the metal.
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A sudden decrease in the rate of temperature rise of heated metal after a certain temperature has been reached (795°C for iron) due to greater absorption of heat.
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Origin of decalescence

From de– Latin calēscere to become warm inchoative of calēre to be warm kelə-1 in Indo-European roots