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DNA (n.)

also D.N.A., 1944, abbreviation of deoxyribonucleic acid (1931).

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Definitions of DNA from WordNet

dna (n.)
(biochemistry) a long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix; associated with the transmission of genetic information;
Synonyms: deoxyribonucleic acid / desoxyribonucleic acid
From wordnet.princeton.edu