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WordNet Dictionary
[n]  a large nucleic acid molecule found in the nucleus but mainly in the cytoplasm of a cell where it is associated with microsomes; consists of a linear polymer of nucleotides; it transmits genetic information from DNA to the cytoplasm and controls certain chemical processes in the cell; "ribonucleic acid is the genetic material of some viruses"
 Synonyms: RNA
 See Also: acceptor RNA, adenine, cytosine, guanine, informational RNA, messenger RNA, mRNA, nRNA, nuclear RNA, nucleic acid, ribose, soluble RNA, template RNA, transfer RNA, tRNA, U, uracil



Medical Dictionary
 Definition: RNA. One of the two nucleic acids found in all cells. The other is deoxyribonucleic acid (DNA). Ribonucleic acid transfers genetic information from DNA to proteins produced by the cell.
Biology Dictionary
 Definition: A chemical found in the nucleus and cytoplasm of cells; it plays an important role in protein synthesis and other chemical activities of the cell. The structure of RNA is similar to that of DNA. There are several classes of RNA molecules, including messenger RNA, transfer RNA, ribosomal RNA, and other small RNAs, each serving a different purpose.
 Definition: An organic acid composed of re- peating nucleotide units of adenine, guanine, cytosine, and uracil, whose ribose components are linked by phosphodiester bonds. (See Antisense RNA, Heterogeneous nuclear RNA, Messenger RNA, Ribosomal RNA, RNA polymerase, Small nuclear RNA, Transfer RNA)