Word Study
    pentose
WORDNET DICTIONARY
Noun pentose has 1 sense
CIDE DICTIONARY
pentose, n. [Penta- + -ose.]. 
                                            
                                         Any of a group of sugars of the formula C5H10O5 , such as as arabinose  or ribose ; -- so called from the five carbon atoms in the molecule. They are not fermented by yeast.                                                                                 [Webster 1913 Suppl.]                                                                                                                    
                                                                                    OXFORD DICTIONARY
pentose, n.  Biochem.  any monosaccharide containing five carbon atoms, including ribose.
                    Etymology
                        PENTA- + -OSE(2)
                                    
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