Trisaccharide

Chem. [f. TRI- 5 + L. saccharum sugar + -IDE. (Not f. TRI- + SACCHARIDE.)] A carbohydrate which on hydrolysis reacts with 2H₂O, yielding three molecules of monosaccharides (sugars having the general formula C_nH_2nO_n); e.g., raffinose, C₁₈H₃₂O₁₆, which yields dextrose, fructose, and galactose; gentianose, C₁₈H₃₂O₁₆, which yields fructose and two molecules of dextrose.

1910.  Armstrong, Simple Carbohydrates & Glucosides, 49. The best-known trisaccharide is raffinose, which is often found … in the sugar beet.