/nooh"klee euh tuyd', nyooh"-/ , n. Biochem.
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.
[ 1905-10; alter. of NUCLEOSIDE ]