/ Dictionary / Index P phosphoro-: Meaning and Definition of Find definitions for: phosphoro- Pronunciation: [key] a combining form representingin compound words: phosphoroscope. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. phosphorize phosphoroscope Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language