carbohydrate: an essential structural component of living cells and source of energy for animals; includes simple sugars with small molecules as well as macromolecular substances; are classified according to the number of monosaccharide groups they contain
chemical: material produced by or used in a reaction involving changes in atoms or molecules
pearl millet: tall grass having cattail like spikes; grown in Africa and Asia for its grain and in the United States chiefly for forage; sometimes used in making beer