partially-defined glycan partially-defined glycans A member of the class of carbohydrates and carbohydrate derivatives that is any oligosaccharide or polysaccharide in which the identity of one or more of the individual monosaccharide units, their connectivity (position of attachment) or the stereochemistry (alpha- or beta-) of one or more of the glycosidic linkages is not known. partially defined glycan partially defined glycans CHEBI:146306 carbohydrates and carbohydrate derivatives