/ Dictionary / Index P phosphorus 32: Meaning and Definition of Find definitions for: phosphorus 32 Pronunciation: [key] — Chem. Chem. a radioactive isotope of phosphorus, used as a chemotherapeutic agent. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. phosphorus phosphorus pentoxide Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language