A monosaccharide with five carbon atoms, of which one is a (potential) aldehyde group; e.g., ribose. ... (05 Mar 2000) ... 
(al″do-pen´tōs) any one of a class of sugars that contain five carbon atoms and an aldehyde group (sbondCHO).
Type: Term Pronunciation: al-dō-pen′tōs Definitions: 1. A monosaccharide with five carbon atoms, one of which is an aldehyde group; ribose.