oligosaccharide(n = noun.substance) - any of the carbohydrates that yield only a few monosaccharide molecules on complete hydrolysis;
is a kind of carbohydrate, saccharide, sugar
has particulars: disaccharide, tetrasaccharide, trisaccharide

oligosaccharide, n. any carbohydrate whose molecules are composed of a relatively small number of monosaccharide units.