noun Biochemistry.
a white, crystalline, water-soluble, slightly sweet solid, C 5 H 1 0 O 5 , a pentose sugar obtained by the hydrolysis of RNA.

1890–95; < German Ribose, earlier Ribonsäure, equivalent to Ribon (from Arabinose arabinose, by arbitrary rearrangement and shortening) + Säure acid

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World English Dictionary
ribose (ˈraɪbəʊz, -bəʊs)
biochem a pentose sugar that is an isomeric form of arabinose and that occurs in RNA and riboflavin. Formula: CH2OH(CHOH)3CHO
[C20: changed from arabinose]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1892, from Ger. Ribose (1891), shortened and arbitrarily rearranged from Eng. arabinose (c.1880), a sugar which is so called because it is formed from gum arabic.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ribose ri·bose (rī'bōs')
A pentose sugar occurring as a component of riboflavin, nucleotides, and nucleic acids.

The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
ribose   (rī'bōs')  Pronunciation Key 
A pentose sugar with a furanose structure that occurs as a component of riboflavin and RNA. Chemical formula: C5H10O5.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Each nucleotide consists of a nitrogenous base, a ribose sugar, and a phosphate.
In one notable case, an entire set of genes required for growth on the sugar ribose were deleted.
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