• synonyms


[af-ter-heet, ahf-]
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noun Physics.
  1. the heat generated by radioactivity remaining in a nuclear reactor after it has been shut down.
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Origin of afterheat

First recorded in 1970–75; after + heat
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for afterheat


  1. the heat generated in a nuclear reactor after it has been shut down, produced by residual radioactivity in the fuel elements
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012