nucleotide

[noo-klee-uh-tahyd, nyoo-]
noun Biochemistry.
any of a group of molecules that, when linked together, form the building blocks of DNA or RNA: composed of a phosphate group, the bases adenine, cytosine, guanine, and thymine, and a pentose sugar, in RNA the thymine base being replaced by uracil.

Origin:
1905–10; alteration of nucleoside

internucleotide, adjective
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World English Dictionary
nucleotide (ˈnjuːklɪəˌtaɪd)
 
n
biochem a compound consisting of a nucleoside linked to phosphoric acid. Nucleic acids are made up of long chains (polynucleotides) of such compounds
 
[C20: from nucleo- + t (added for ease of pronunciation) + -ide]

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American Heritage
Medical Dictionary

nucleotide nu·cle·o·tide (nōō'klē-ə-tīd', nyōō'-)
n.
Any of various compounds consisting of a nucleoside combined with a phosphate group and forming the basic constituent of DNA and RNA.

The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
nucleotide   (n'klē-ə-tīd')  Pronunciation Key 
Any of a group of organic compounds composed of a nucleoside linked to a phosphate group. Nucleotides are the basic building blocks of nucleic acids.
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American Heritage
Cultural Dictionary
nucleotides [(nooh-klee-uh-teyedz)]

The molecules that form the basic modular structure of the double helix of the DNA molecule. A nucleotide consists of three molecules — a sugar, a phosphate group, and a molecule called a base. If the double helix is a twisted ladder, the sugar and phosphates form the sides of the ladder and pairs of bases form the rungs. There are four different bases, usually abbreviated A, C, G, and T for adenine, cytosine, guanine, and thymine). The order of bases in DNA determines the genetic code.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
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Example sentences
The chains form the terms double helix and nucleotides.
The end result is a brain that is much, much more than simply the sum of the
  nucleotides that encode a few thousand proteins.
If a gene mutates, one or more of the nucleotides in its sequence changes.
Each gene consists of a long strand of molecules, called nucleotides.
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