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A covalent chemical bond that links two carbon atoms through a phosphate group, especially the bonds that link the pentose sugars of adjacent nucleotides in polynucleotide chains of RNA and DNA.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.