a draft horse used for pulling a dray.
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Examples from the Web for drayhorse
Will a Courser of the Sun work softly in the harness of a Drayhorse?Life of Robert Burns|Thomas Carlyle
/ (ˈdreɪˌhɔːs) /
a large powerful horse used for drawing a dray
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