A molecule made up of several simple sugar groups joined by glycosidic bonds.

From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.

An oligosaccharide is a polymer of between 2 and 20 monosaccharides. These are differentiated from polysaccharides by their large, but limited nature, being medium-sized carbohydrates. Oligosaccharides are formed through glycosidic bonds by hydrolysis of several monosaccharides. The simplest form of an oligosaccharide is called a disaccharide.

A quick example of an oligosaccharide (and a disaccharide) is sucrose, aka table sugar.

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