/ Dictionary / Index P pentose nucleic acid: Meaning and Definition of Find definitions for: pen'tose nucle'ic ac'id Pronunciation: [key] — Biochem. Biochem. a nucleic acid containing a pentose. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pentose Pentothal Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language