gly·co·pro·tein (gl??k?-pr??t?n?, -t?-?n)n. Any of a group of conjugated proteins having a carbohydrate as the nonprotein component.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.glycoprotein (??la?k???pr??ti?n) , glucoprotein or glycopeptiden (Biochemistry) any of a group of conjugated proteins containing small amounts of carbohydrates as prosthetic groups. See also mucoproteinCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014gly?co?pro?tein (?gla? ko??pro? tin, -ti ?n) n. any of a group of complex proteins, as mucin, containing a carbohydrate combined with a simple protein. Also called gly`co?pep?tide (-?p?p ta?d) [1905?10] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.