/ Dictionary / Index N nucleic acid: Meaning and Definition of Find definitions for: nu•cle'ic ac'id Pronunciation: (n-klē'ik, -klā'-, ny-), [key] — Biochem. Biochem. any of a group of long, linear macromolecules, either DNA or various types of RNA, that carry genetic information directing all cellular functions: composed of linked nucleotides. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nuclei nucleo- Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language