Monosaccharide in guanosine

• Biochemical sugar
• RNA sugar
• A pentose sugar important as a component of ribonucleic acid
• RNA component
• Adenosine component

Wiktionary Word definitions in Wiktionary
n. (context carbohydrate English) A naturally occurring pentose sugar, which is a component of the nucleosides and nucleotides that comprise the nucleic acid biopolymer, RNA. It is also found in riboflavin.

Wikipedia Word definitions in Wikipedia
Ribose is a carbohydrate with the formula CHO; specifically, it is a pentose monosaccharide (simple sugar ) with linear form H−(C=O)−(CHOH)−H, which has all the hydroxyl groups on the same side in the Fischer projection . The term may refer to either of ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Pentose \Pen"tose\, n. [Penta- + -ose.] (Chem.) 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.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1892, from German Ribose (1891), from Ribonsäure , a tetrahydroxy acid, with first element shortened and arbitrarily rearranged from English arabinose (c.1880), a sugar which is so called because it is formed from gum arabic .