noun (n)

• an essential structural component of living cells and source of energy for animals; includes simple sugars with small molecules as well as macromolecular substances; are classified according to the number of monosaccharide groups they contain(noun.substance)

  Synonym:
  saccharide, sugar
  

  source: wordnet30
• One of a group of compounds including the sugars, starches, and gums, which contain six (or some multiple of six) carbon atoms, united with a variable number of hydrogen and oxygen atoms, but with the two latter always in proportion as to form water; as dextrose, C₆H₁₂O₆.(noun)

  source: webster1913