tetrasaccharide
Technical term in chemistry for a carbohydrate composed of four monosaccharide units.
A tetrasaccharide is a carbohydrate formed by linking four monosaccharides.
多糖 (polysaccharide) refers to polymers with many sugar units, whereas 四糖 specifically has four.
Compound of 四 (four) and 糖 (sugar), following the pattern of other saccharide terms.