a "dinucleotide" is a single piece of DNA or RNA that is two nucleotides long.
The example you give of a thymidine dinucleotide would be two thymidine nucleotides attached by a phosphate bridge - in this case, the 5'-phophate of one thymidine bonds to the 3'-hydroxyl group of the other thymidine, just as the bonding occurs in complete DNA and RNA molecules.
http://www.madsci.org/posts/archives/2001-02/982619379.Bc.r.html
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