a type of mechanical stoker for a furnace, in which the grate consists of an endless chain that draws the solid fuel into the furnace as it rotates
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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
Examples from the Web for chain grate
That most usually employed is known as the “chain-grate” stoker.