/ Dictionary / Index P preop: Meaning and Definition of Find definitions for: pre•op Pronunciation: (prē'op'), [key] — adj., adv. Informal. preoperative; preoperatively. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. preoccupy preoperative Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language