from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A sudden glowing in a cooling metal caused by liberation of the latent heat of transformation.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. an increase in temperature that occurs while cooling metal through a range of temperatures in which change in structure occurs

from The Century Dictionary and Cyclopedia

  • n. Renewed calescence; reglow; specifically, in physics, a phenomenon exhibited by iron as it cools gradually from a white heat (point of high incandescence): at certain temperatures, as at 1,000˚, the cooling seems to be arrested, and the iron glows more brilliantly for a short time.
  • n. Steel in cooling from a temperature of, say, 1,000° C. may exhibit recalescence or evolution of heat at three points, namely, at about 850°, 750°, and 650°. At the last of these the phenomenon is most marked.


From Latin recalēscēns, recalēscent-, present participle of recalēscere, to grow warm again : re-, re- + calēscere, to become warm, inchoative of calēre, to be warm; see kelə-1 in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin recalescere ("to grow warm again"), from re- + calescere ("to grow warm"), inchoative of calēre ("to be warm"). In use since at least 1873 (Webster's Ninth New Collegiate Dictionary, published 1985). (Wiktionary)


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