Glycoprotein: A molecule that consists of a carbohydrate plus a protein. Glycoproteins play essential roles in the body. For instance, in the immune system almost all of the key molecules involved in the immune response are glycoproteins. A glycopeptide is similar in structure to a glycoprotein but has a shorter chain of amino acids. CONTINUE SCROLLING OR CLICK HERE FOR RELATED ARTICLE Reviewed on 12/11/2018 Health Solutions From Our Sponsors Clinical Trial Q&A Alternative Pain Relief Penis Curved When Erect How Immunotherapy Fights Cancer Overcoming Breast Cancer Need Help Quitting Smoking?