tetrasaccharide: any of a variety of carbohydrates that yield four monosaccharide molecules on complete hydrolysis
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
redirect examination: (law) questioning of a witness by the party that called the witness after that witness has been subject to cross-examination