/ Dictionary / Index P phreno-: Meaning and Definition of Find definitions for: phreno- Pronunciation: [key] a combining form meaning “mind,” “diaphragm,” used in the formation of compound words: phrenology. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. phrenitis phrenol. 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