Nucleoside
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- A building block of DNA and RNA, consisting of a nitrogenous base linked to a five carbon sugar. (See Nucleoside analog.)
Susan Allender-Hagedorn and Charles Hagedorn - Cite This Source - This Definition - A base (purine or pyrimidine ) that is covalently linked to a 5-carbon (pentose) sugar. When the sugar is ribose, the nucleoside is a ribonucleoside; when it is 2-deoxyribose, the nucleoside is a deoxyribonucleoside. See: nucleotide.
UN Food and Agriculture Organization - Cite This Source - This Definition - deoxyribose (2-deoxyribose), Nucleotide, ribose, thymidine