nucleoside


nu·cle·o·side

noun \ˈnü-klē-ə-ˌsīd, ˈnyü-\

Definition of NUCLEOSIDE

:  a compound (as guanosine or adenosine) that consists of a purine or pyrimidine base combined with deoxyribose or ribose and is found especially in DNA or RNA

Origin of NUCLEOSIDE

International Scientific Vocabulary nucle- + 2-ose + -ide
First Known Use: 1911

nu·cle·o·side

noun \ˈn(y)ü-klē-ə-ˌsīd\   (Medical Dictionary)

Medical Definition of NUCLEOSIDE

: a compound (as guanosine or adenosine) that consists of a purine or pyrimidine base combined with deoxyribose or ribose and is found especially in DNA or RNA—compare nucleotide

nucleoside

noun    (Concise Encyclopedia)

Any of a class of organic compounds, including structural subunits of nucleic acids. Each consists of a molecule of a five-carbon sugar (ribose in RNA, deoxyribose in DNA) and a nitrogen-containing base, either a purine or a pyrimidine. The base uracil occurs in RNA, thymine in DNA, and adenine, guanine, and cytosine in both, as part of the nucleosides uridine, deoxythymidine, adenosine or deoxyadenosine, guanosine or deoxyguanosine, and cytidine or deoxycytidine. Nucleosides usually have a phosphate group attached, forming nucleotides. Usually obtained by decomposition of nucleic acids, nucleosides are important in physiological and medical research. Those that are not part of nucleic acids include puromycin and certain other antibiotics produced by fungi.

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