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(Arms & Armour (excluding Firearms)) a piece of armour for protecting the knee. Also called: kneecap
[from Old French polain]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈpoʊ leɪn)

armor for the knee.
[1350–1400; Middle English poleyn, polayne < Old French po(u)lain, of uncertain orig.]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
part of the body did a piece of armour called a poleyn protect?
The artifacts of armor included sabatons or foot defences, poleyn or knee defences, and spurs with elegant, four-inch necks holding the rowls.