1) Aldose 2) Hexose 1) Glucose 
An aldohexose is a hexose with an aldehyde group on one end. The aldohexoses have four chiral centres for a total of 16 possible aldohexose stereoisomers (24). Of these, only three commonly occur in nature: D-glucose, D-galactose, and D-mannose. The D/L configuration is based on the orientation of the hydroxyl at position 5, and does not refer to ...
A 6-carbon sugar characterised by the (potential) presence of an aldehyde group in the molecule; e.g., glucose, galactose. ... (05 Mar 2000) ... 
Type: Term Pronunciation: al-dō-heks′ōs Definitions: 1. A 6-carbon sugar characterized by the presence of an aldehyde group in the molecule, glucose, galactose.
[n] - a monosaccharide sugar having six carbon atoms and an aldehyde group
noun a monosaccharide sugar having six carbon atoms and an aldehyde group
any of several hexoses in which one carbon atom is part of an aldehyde structure.