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[Middle English destrer, from Anglo-Norman, from Vulgar Latin *dextrārius, right-hand, from Latin dexter, right; see deks- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Military) an archaic word for warhorse1
[C13: from Old French, from destre right hand, from Latin dextra; from the fact that a squire led a knight's horse with his right hand]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
des•tri•er(ˈdɛs tri ər, dɛˈstrɪər)
[1250–1300; Middle English destrer < Anglo-French; Old French destrier, literally, (horse) led at the right hand]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.