- Any of various simple sugars, such as glucose and fructose, that have six carbon atoms per molecule.
- A simple sugar (monosaccharide) containing six atoms of carbon.
- Any member of a group of sugars containing six carbon atoms in the molecule. Some are widely distributed in nature, esp. in ripe fruits.
- A <xref>sugar</xref> or <xref>saccharide</xref> containing six <xref>carbon</xref> <xref>atoms</xref>.
- a monosaccharide that contains six carbon atoms per molecule