/ Dictionary / Index P pentose: Meaning and Definition of Find definitions for: pen•tose Pronunciation: (pen'tōs), [key] — n. Chem. a monosaccharide containing five atoms of carbon, as xylose, CHO, or produced from pentosans by hydrolysis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pentose (Thesaurus) pentosan pentose nucleic acid 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