define complex carbohydrates
Medical Definition of COMPLEX CARBOHYDRATE. : a polysaccharide (as starch or cellulose) consisting of usually hundreds or thousands of monosaccharide units; also: a food (as rice or pasta) composed primarily of such polysaccharides.ADVERTISEMENT.noun.efinition of COMPLEX CARBOHYDRATE. : a polysaccharide (as starch or cellulose) consisting of usually hundreds or thousands of monosaccharide units; also: a food (as rice or pasta) composed primarily of such polysaccharides. ADVERTISEMENT. noun.