any of a group of glycoproteins found in connective tissue, mucous secretions, blood plasma, gastric juice, urine, etc.
See mucoprotein in American Heritage Dictionary 4
(myo͞oˌkō-prōˈtēnˌ, -prōˈtē-ĭn)
noun
Any of a group of organic compounds, such as the mucins, that consist of a complex of proteins and glycosaminoglycans and are found in body tissues and fluids.