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Source : Webster's Revised Unabridged Dictionary (1913)

Monosaccharide \Mon`o*sac"cha*ride\, n. Also -rid \-rid\ .
   [Mono- + saccharide.] (Chem.)
   A simple sugar; any of a number of sugars (including the
   trioses, tetroses, pentoses, hexoses, etc.), not decomposable
   into simpler sugars by hydrolysis. Specif., as used by some,
   a hexose. The monosaccharides are all open-chain compounds
   containing hydroxyl groups and either an aldehyde group or a
   ketone group.

Trisaccharide \Tri*sac"cha*ride\, n. Also -rid \-rid\ (Chem.)
   A complex sugar, as raffinose, yielding by hydrolysis three
   simple sugar molecules.