noun Chemistry.

a monosaccharide containing five atoms of carbon, as xylose, C5H10O5, or produced from pentosans by hydrolysis.

Origin of pentose

< German (1890); see pent(a)-, -ose2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Historical Examples of pentose

British Dictionary definitions for pentose



any monosaccharide containing five atoms of carbon per molecule: occur mainly in plants and the nucleic acids

Word Origin for pentose

C20: from penta- + -ose ²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

pentose in Medicine


[pĕntōs′, -tōz′]


Any of a class of monosaccharides having five carbon atoms per molecule and including ribose and several other sugars.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

pentose in Science



Any of a class of simple sugars (monosaccharides) having five carbon atoms per molecule. Ribose and deoxyribose are pentoses.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.