RNA (n.)

1948, abbreviation of ribonucleic acid (see ribonucleic).

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Definitions of RNA from WordNet

rna (n.)
(biochemistry) a long linear polymer of nucleotides found in the nucleus but mainly in the cytoplasm of a cell where it is associated with microsomes; it transmits genetic information from DNA to the cytoplasm and controls certain chemical processes in the cell;
Synonyms: ribonucleic acid