/ Dictionary / Index P pentahydric: Meaning and Definition of Find definitions for: pen•ta•hy•dric Pronunciation: (pen"tu-hī'drik), [key] — adj. Chem. (esp. of alcohols and phenols) pentahydroxy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pentahydrate pentahydroxy Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language