grapes (?re?ps) n (Veterinary Science) (functioning as singular) vet science archaic an abnormal growth, resembling a bunch of grapes, on the fetlock of a horseCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014