/ Dictionary / Index P perchloro-: Meaning and Definition of Find definitions for: perchloro- Pronunciation: [key] a combination ofandperchloromethane. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. perchlorinate perchloroethane Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language