decalescence

n.
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.

[From DE- + Latin calēscere, to become warm, inchoative of calēre, to be warm.]

decalescent de'ca·les'cent adj.

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The noun has one meaning:

Meaning #1: phenomenon that occurs when a metal is being heated and there is a sudden slowing in the rate of temperature increase; slowing is caused by a change in the internal crystal structure of the metal

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