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In polysaccharides, the linkage connecting monosaccharides is called glycoside (glycosidic linkage).Glycosidic linkage is the covalent bond between two or more monosaccharides to form a polysaocharide. It is formed between the hemiacetal or hemiketal group of a saccharide (or a molecule derived from a saccharide) and the hydroxyl group of some compound such as alcohol. A substance containing a glycosidic bond is a glycoside.