/ Dictionary / Index P pentachlorophenol: Meaning and Definition of Find definitions for: pen•ta•chlo•ro•phe•nol Pronunciation: (pen"tu-klôr"u-fē'nôl, -nol, -klōr"-), [key] — n. Chem. a white, crystalline, water-insoluble powder, CClOH, used chiefly in fungicides, disinfectants, and wood preservatives. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pentachloronitrobenzene pentacle Related Content Daily Word Quiz: hale Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language