Source : Webster's Revised Unabridged Dictionary (1913)

Raffinose \Raf"fi*nose`\, n. [F. raffiner to refine.] (Chem.)
   A colorless crystalline slightly sweet substance obtained
   from the molasses of the sugar beet.

Source : WordNet®

raffinose
     n : a trisaccharide that occurs in sugar beets and cotton seeds
         and certain cereals