1. 
   pentoses
   Sugars (monosaccharide) with five carbon atoms. Include ribose and deoxyribose of nucleic acids, and many others such as the aldoses arabinose and xylose, and the ketoses ribulose and xylulose.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   pentoses
   A class of carbohydrates that contains five carbon atoms. ... (12 Dec 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?pentoses
   
   

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