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[noo-klee-uh-sahyd, nyoo-] /ˈnu kli əˌsaɪd, ˈnyu-/
noun, Biochemistry.
any of the class of compounds derived by the hydrolysis of nucleic acids or nucleotides, consisting typically of deoxyribose or ribose combined with adenine, guanine, cytosine, uracil, or thymine.
Origin of nucleoside
1910-15; nucle(ic) + -ose2 + -ide Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for nucleoside


(biochem) a compound containing a purine or pyrimidine base linked to a sugar (usually ribose or deoxyribose)
Word Origin
C20: from nucleo- + -ose² + -ide
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
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nucleoside in Medicine

nucleoside nu·cle·o·side (nōō'klē-ə-sīd', nyōō'-)
Any of various compounds consisting of a sugar, usually ribose or deoxyribose, and a purine or pyrimidine base, especially a compound obtained by hydrolysis of a nucleic acid, such as adenosine or guanine.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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nucleoside in Science
Any of various compounds consisting of a sugar, usually ribose or deoxyribose, and a nitrogen base (a purine or pyrimidine). Nucleosides are constituents of the nucleotides of nucleic acids. Adenosine and thymidine are nucleosides.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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