(biochemistry) any of various macromolecules composed of nucleotide chains that are vital constituents of all living cells WordNet 3.0 & Open English WordNet

Nucleic acids are biopolymers, macromolecules, essential to all known forms of life. Wikipedia

Large biomolecules essential to known life Wikidata

Any of several organic acids combined with proteins (DNA or RNA) which exist in the nucleus and protoplasm of all cells. OmegaWiki

Any acidic, chainlike biological macromolecule consisting of multiple repeat units of phosphoric acid, sugar and purine and pyrimidine bases; they are involved in the preservation, replication and expression of hereditary information in every living cell. Wiktionary

Acidic chainlike biological macromolecule. Wiktionary (translation)