red heat

the temperature of a red-hot body.
the condition of being red-hot.

1680–90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
red heat
1.  the temperature at which a substance is red-hot
2.  the state or condition of being red-hot

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The slide shows a photograph of a meerkat standing, sunny himself under a red heat lamp.
Rhodium is silvery white and, at red heat, slowly oxides in air.
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