proteoglycan
noun
pro·teo·gly·can ˌprō-tē-ə-ˈglī-ˌkan 
: any of a class of glycoproteins of high molecular weight that are found especially in the extracellular matrix of connective tissue
Word History
Etymology
proteo- + glycan
First Known Use
1967, in the meaning defined above
Medical Definition
proteoglycan
noun
pro·teo·gly·can ˌprōt-ē-ə-ˈglī-ˌkan
: any of a class of glycoproteins of high molecular weight that are found in the extracellular matrix of connective tissue, are made up mostly of carbohydrate consisting of various polysaccharide side chains linked to a protein, and resemble polysaccharides rather than proteins in their properties