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(Building) a system of heating a building by radiant heat emitted from panels containing electrical conductors, hot water, etc
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. the means of heating objects or persons by radiation in which the intervening air is not heated.
2. a system for heating by radiation from a surface, esp. from a surface heated by means of electric resistance, hot water, etc.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.