(biochemistry) an organic molecule in which a nitrogenous heterocyclic base (or nucleobase), which can be either a double-ringed purine or a single-ringed pyrimidine, is covalently attached to a five-carbon pentose sugar (deoxyribose in DNA or ribose in RNA). When the phosphate group is covalently attached to the pentose sugar, it forms a nucleotide.

plural of nucleoside

(organic chemistry) Reaction with, or conversion to, a nucleoside

Relating to a nucleoside

plural of nucleosidation

plural of C-nucleoside

(biochemistry) Any nucleoside that has a direct C-C bond between the carbohydrate and the heterocycle