Oxford Dictionary English nucleic acid noun noun BrE BrE//njuːˌkliːɪk ˈæsɪd// ; NAmE NAmE//nuːˌkliːɪk ˈæsɪd// ; BrE BrE//njuːˌkleɪɪk ˈæsɪd// ; NAmE NAmE//nuːˌkleɪɪk ˈæsɪd// [uncountable] (chemistry) Add to my wordlistjump to other results either of two acids, DNA and RNA, that are present in all living cellsSee nucleic acid in the Oxford Learner's Dictionary of Academic EnglishSee nucleic acid in the Oxford Advanced American DictionaryCheck pronunciation: nucleic acid oxfordlearnersdictionaries.com