/ Dictionary / Index P patulin: Meaning and Definition of Find definitions for: pat•u•lin Pronunciation: (pat'yoo-lin, pach'oo-), [key] — n. Pharm. a toxic antibiotic, CHO, derived from various fungi, as Penicillium patulum and Aspergillus clavatus. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Patuca patulous Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language