what is a polysaccharide?
Definition of POLYSACCHARIDE. : a carbohydrate that can be decomposed by hydrolysis into two or more molecules of monosaccharides; especially: one (as cellulose, starch, or glycogen) containing many monosaccharide units and marked by complexity. See polysaccharide defined for kids.ADVERTISEMENT.edical Definition of POLYSACCHARIDE. : a carbohydrate that can be decomposed by hydrolysis into two or more molecules of monosaccharides; especially: one (as cellulose, starch, or glycogen) containing many monosaccharide units and marked by complexityâcalled also glycan.