A nucleic acid that is an essential component of all cells, composed of a long, usually single-stranded chain of nucleotide units that contain the sugar ribose; ribonucleic acid.
Webster's New World
RNA stands for ribonucleic acid, which is a long, single-stranded chain of cells that processes protein.
An example of RNA is a chain of cells that carries genetic information of many viruses from the cell to the cytoplasm.
Other Word Forms of RNA
Origin of RNA
From American Heritage Dictionary of the English Language, 5th Edition