Nucleotide
WordNet
noun
(1) A phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA)
WiktionaryText
Noun
- the monomer comprising DNA or RNA biopolymer molecules. Each nucleotide consists of a nitrogenous heterocyclic base (or nucleobase), which can be either a double-ringed purine or a single-ringed pyrimidine; a five-carbon pentose sugar (deoxyribose in DNA or ribose in RNA); and a phosphate group.