beta-glucan

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be·ta-glu·can

 (bā′tə-glo͞o′kăn′ -kən)
n.
Any of various polysaccharides, such as cellulose, that are composed of glucose monomers and are found chiefly in the cell walls of fungi and plants, especially oats and barley. Beta-glucans are added to foods as a source of dietary fiber and are used as dietary supplements.