Noun
a monosaccharide sugar that contains the aldehyde group or is hemiacetal
Source: WordNetThe resulting molecule has an hemiacetal or hemiketal group, depending on whether the linear form was an aldose or a ketose. Source: Internet
The number of open chain stereoisomers for an aldose monosaccharide is larger by one than that of a ketose monosaccharide of the same length. Source: Internet