/ Dictionary / Index P pharmaco-: Meaning and Definition of Find definitions for: pharmaco- Pronunciation: [key] a combining form meaning “drug,” used in the formation of compound words: pharmacology. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pharmacist pharmacodynamics Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language