nucleic acids Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. any of various acids as an RNA or a DNA composed of nucleotide chains Example Sentence The two main nucleic acids are DNA and RNA. Synonyms linked nucleotide; DNA; RNA Antonyms registered nurse Hear It! Say It! Write It! nucleic acids Switch to cursive Start Share with your friends: